Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 24745: For the function y = x2 - 4x - 5, perform the following tasks:
a) Put the function in the form y = a(x - h)2 + k. Can you please give me the answer?

Click here to see answer by Earlsdon(6287)

Question 24850: I REALLY NEED THE ANSWER IN DETAIL TO THIS PROBLEM..ITS DUE TOMORROW and its very important. THANK YOU
* A window in a bulinging is 18m above the ground. From this window, the angle of elevation to the top of the building across the street is 40° and the angle of depression to the bottom of the building acress the street is 42°. How tall is the building across the street? Include a labelled diagram with you solution.
Click here to see answer by venugopalramana(3286)

Question 24818: I REALLY NEED THE ANSWER IN DETAIL TO THIS PROBLEM..ITS DUE TOMORROW and its very important. THANK YOU
* A window in a bulinging is 18m above the ground. From this window, the angle of elevation to the top of the building across the street is 40° and the angle of depression to the bottom of the building acress the street is 42°. How tall is the building across the street? Include a labelled diagram with you solution.
Click here to see answer by venugopalramana(3286)

Question 24873: 3) Suppose you throw a baseball straight up at a velocity of 64 feet per second. A function can be created by expressing distance above the ground, s, as a function of time, t. This function is s = -16t2 + v0t + s0
16 represents 1/2g, the gravitational pull due to gravity (measured in feet per second2).
v0 is the initial velocity (how hard do you throw the object, measured in feet per second).
s0 is the initial distance above ground (in feet). If you are standing on the ground, then s0 = 0.
a) What is the function that describes this problem?
Answer:

b) The ball will be how high above the ground after 1 second?
Answer:
Show work in this space.

c) How long will it take to hit the ground?
Answer:
Show work in this space.

d) What is the maximum height of the ball? What time will the maximum height be attained?
Answer:
Show work in this space.

Click here to see answer by wuwei96815(245)

Question 24872: 1. 7(1+5y)+8y
2. (6m+9)4+5m
Click here to see answer by elima(1433)

Question 24915: Hi,
I would like to know why is 2x3+6x-1 is not a quadratic funtion
Click here to see answer by kev82(148)

Question 25075: **im just wondering if someone can help me out with this trig. problem...i really dont know what to do and its due tomorrow!... thanks
A window in a building is 18m above the ground. From this window, the angle of elevation to the top of the building across the street is 40degrees and the angle of depression to the bottom of the building across the street is 42degrees. How tall is the building across the street? Include a labelled diagram with your solution.
Click here to see answer by Paul(988)

Question 25074: **im just wondering if someone can help me out with this trig. problem...i really dont know what to do and its due tomorrow!... thanks
A window in a building is 18m above the ground. From this window, the angle of elevation to the top of the building across the street is 40degrees and the angle of depression to the bottom of the building across the street is 42degrees. How tall is the building across the street? Include a labelled diagram with your solution.
Click here to see answer by venugopalramana(3286)

Question 25096: please explaen me how to solve this equations
7n+2=4n+17

-2k+19=3k-1
Click here to see answer by Earlsdon(6287)

Question 25163: One endpoint of a line segment is (-3,-4). If the midpoint of the segment is at the origin, what are the coordinates of the other endpoint?
Click here to see answer by wuwei96815(245)

Question 25152: The perimeter of a rectangle is 80 feet. The length of the rectangle is 2 feet less than 5 times the width. What is the length and width of the rectangle?
Click here to see answer by quentin252(19)

Question 25149: The perimeter of a triangle is 43 inches. The second side is three inches longer than the first side. The third side is one inch longer than the second. Find the length of each side.
Click here to see answer by wuwei96815(245)

Question 25147: Please help me to help my son."Quadratic Equations and functions"_word problem. "A manufacturer determines that the number of drills it can sell is given by the formula D= -5p^2+520p-240 where p is the price of the drills in dollars.
a) At what price will the manufacturer sell the maximum number of drills?
b) What is the maximum number of drills that can be sold?
I hope that I typed this correctly. It should read as D= -5p squared, etc. Also, the answer is on a graph. ????? Thank you for your help.
Click here to see answer by longjonsilver(2297)

Question 25173: what difference to a quadratic graph does the co-efficient of x make
Click here to see answer by queenofit(120)

Question 25173: what difference to a quadratic graph does the co-efficient of x make
Click here to see answer by rapaljer(4667)

Question 25142: Hi, I am a mother trying to assist my son in studying for a test. We are working on "Quadratic Equations and Functions". Here is the question.... Graph the function. If a>0 find the minimum value. If a<0 find the maximum value. Graph below
Click here to see answer by queenofit(120)

Question 25337: 8x-12

AND TELL ME HOW TO FIGURE EM OUT CUZ I RIPPED OUT MY HAIR AND BALLS TRYING
Click here to see answer by longjonsilver(2297)

Question 25389: How do I solve this one:
Sally was making a peanut butter and jelly sandwich. Sally cut off 1cm off each edge of the bread. If the bread is a square and the area removed was 32 cm^2 what is the length of a side of the sandwich (now that the 1 cm was removed)
I have tried using (x-1)(x-1) = 32 cm, but I already have been told an answer of "7" by my teacher. I cannot get the quadratic equation, when the coefficients are plugged in, to work and render '7'. Thanks.

Click here to see answer by stanbon(57352)

Question 25346: Hello good sir,
I have a kunundrum about these equations...
how do i factor these fully
x2-81 , x2-25=0 , and x2-2x-15=0
thank you kind samaritan for doing this, and if u finish these for me u shall earn a seat at my round table.
Click here to see answer by elima(1433)

Question 25472: I need help with this promblem:x-4=6x+21. i have tried everything please help me!!!!!!!!!!!!!!!!!!!!!!!
Click here to see answer by elima(1433)

Question 25530: Suppose you have a 9 quart container and a 4 quart container. How can you obtain exactly 6 quarts of water in the large container?
Click here to see answer by AnlytcPhil(1277)

Question 25608: I am trying to help a homeschooled student with algebra. We are stumped on a problem. It's on a page where you are supposed to use the quadratic formula to solve but i'm having a hard time setting up the equation. It says; working alone Colleen can paint a house in 2 h less than James. Working together, they can paint the house in 10 h. How long would it take James to paint the house by himself? Thank you!
Click here to see answer by elima(1433)

Question 25616: I have two problems I need help with. The first one is {8x+1} = x+2 and the second one is 4{2x} + 4{x+3} = 0 We tried several times not being able to solve. Thank you in advance.
Click here to see answer by queenofit(120)

Question 25640: For what values of x and y does (x+y)^3=x^3+y^3?
Click here to see answer by stanbon(57352)

Question 25661: Consider the equation with the formula y=x squared+6x-1 A)find the values of x when y=0 B) find the vertex of the parabola C) graph the parabola and d) give the line of symmentry
I believe for part B i first must get the formula into vertex form and that should help me with the rest of the parts to the question but for part A, I do not understand how i would answer with the qaudratic Formula. Would it be -6 plus or minus the square root of 6 squared - 4*a*c over 2*a ?
Click here to see answer by stanbon(57352)

Question 24542: please put the function in the form
what is its line of symmetry?
how it compares to graph of ?
Click here to see answer by venugopalramana(3286)

Question 25681: Can someone please help me with this problem? I am stumped! This is the problem:
Show how the quadratic formula can be expressed as:
±

let p= and q=
It says that it can be derived by "completing" the square of a quadratic equation. A response to this problem would really make my day!
Click here to see answer by venugopalramana(3286)

Question 24762: Could you please help me answer 2 question. It would be greatly appreciated since i am having great difficulty and would need the answers asap.
John has 300 feet of lumber to frame a rectangular patio (the perimeter of a rectangle is 2 times length plus 2 times width). He wants to maximize the area of his patio (area of a rectangle is length times width). What should the dimensions of the patio be?
Answer:
and
2) For the function y = x2 - 4x - 5, perform the following tasks:
a) Put the function in the form y = a(x - h)2 + k.
b) What is the line of symmetry?
c) Graph the function using the equation in part
a. Explain why it is not necessary to plot points to graph when using y = a (x – h)2 + k.
Show graph here.
Explanation of graphing.
d) In your own words, describe how this graph compares to the graph of y = x2?
Click here to see answer by venugopalramana(3286)

Question 24896: 2) For the function y = x2 - 4x - 5, perform the following tasks:
a) Put the function in the form y = a(x - h)2 + k.
Answer:
Show work in this space

b) What is the line of symmetry?
Answer:

c) Graph the function using the equation in part a. Explain why it is not necessary to plot points to graph when using y = a (x - h)2 + k.
Show graph here.

Explanation of graphing.

d) In your own words, describe how this graph compares to the graph of y = x2?
Answer:

Click here to see answer by venugopalramana(3286)

Question 25735: The length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base. If the perimeter is 29 cm, find the length of one of the equal legs. Every solution that I come up with is not a whole number or does not work when you try to check it.
Click here to see answer by Paul(988)

Question 25752: find the standard form for the equation of a circle (x-h)sqrd + (y-k)sqrd=rsqrd with a diameter that has endpoints (0,-7) and (4,-10) . i gor h=2 and k=-8.5 but rsqrd=?
Click here to see answer by venugopalramana(3286)

Question 25808: can you help me answer this question
2(5x-1)=4-3x/2
Click here to see answer by atif.muhammad(135)

Question 25808: can you help me answer this question
2(5x-1)=4-3x/2
Click here to see answer by jen0921(1)

Question 25817: The problem is:
A DVD company wants to maximize its revenue. the company now sells dvd's for $40 each and they have 6000 customers. a study suggests that for every $2.00 increase in price they will lose 200 customers. what should be the selling price to maximize the company's revenue? what will that revenue be?
So far I've written an equation:
let R= revenue
let x= # of $2 increases
R=(6000-200x)(40+x)
When i try to solve, I get: x=-5 and R=245000 but I know x can not be negative.
Click here to see answer by Paul(988)

Question 25852: Find two consecutive integers such that the sum of 4 times the first integer and 8 times second integer is 68.
Click here to see answer by elima(1433)

Question 25895: 11x^2+33x=0
Click here to see answer by Linz(9)

Question 25931: Please help me find the vertex and intercepts for this quadratic function, and help me to sketch its graph.
y = x^2 - 6x
Click here to see answer by venugopalramana(3286)

Question 25938: Please help me find the vertex and intercepts for this quadratic function, and sketch its graph.
y = -3x^2 + 6x
Click here to see answer by venugopalramana(3286)

Question 25938: Please help me find the vertex and intercepts for this quadratic function, and sketch its graph.
y = -3x^2 + 6x
Click here to see answer by Earlsdon(6287)

Question 25937: Please help me find the vertex and intercepts for this quadratic function, and sketch its graph.
y = -2x^2 + 8x
Click here to see answer by venugopalramana(3286)

Question 25934: Please help me find the vertex and intercepts for this quadratic function, and help me to sketch its graph.
y = x^2 + 4x
Click here to see answer by venugopalramana(3286)

Question 25954: Could someone help me find the complex solution of the following:
a. 2x^2 + 3 = 3x
b. 1/2x^2 - 5x + 13 = 0
Click here to see answer by elephantsize(7)

Question 26045: 6sin^2x - sinx - 2 = 0
Click here to see answer by AnlytcPhil(1277)

Question 26163: The problem is about using the addition and multiplication principles together. Here is problem #46:
3(x-2)+2=2(x-4) How do I go about doing this problem?
Click here to see answer by stanbon(57352)

Question 26263: Can anyone help me with a word problem that I am stuck on? I need to put it into an equation and solve it. It is:
As part of an exercise regiment, you walk 2 miles on an indoor track. Then you jog at twice your walking speed for another 2 miles. If the total time spent walking and jogging is 1 hour, find the walking and jogging rates.
Thank you!
Click here to see answer by Paul(988)

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