Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 153169: 2x^2 = 4, this is incomplete quadratic equation, how can i solve it?
Click here to see answer by oscargut(891)

Question 153237: The members of a flying club plan to share equally the cost of $200,000 airplane. The members want to find five more people to join the club so that the cost per person will decrease by $2,000. How many members are currently in the club?
Click here to see answer by checkley77(12569)

Question 153236: The manager at Cream of the Crop bought a load of watermelons for $200. She priced the melons so that she would make $1.50 profit for each melon. When all but 30 had been sold, the manager had recovered her initial investment. How many did she buy originally?
Click here to see answer by checkley77(12569)

Question 153339: Please help with this equation.
Solve using the quadratic formula:
x^2-7x-1=-7
Thank you!
Click here to see answer by mangopeeler07(462)

Question 153351: Hello, I am in deep need of help. I am suppose to use the sqrt property to solve equation.
(a-2)^2=8
Thanks for anyone that can help.
Click here to see answer by Earlsdon(6287)

Question 153357: Help!!!!
Write the equation 4x(x-13)=-168 in quadratic form and then solve it by factoring.
Thanks
Click here to see answer by ankor@dixie-net.com(15649)

Question 153356: Reading problem
The height h(in feet) of an object that is dropped from the height of s feet is given by the formula h=s-16t^2, where t is the time the object has been falling. A 6 foot tall woman on a sidewalk looks directly overhead and sees a window washer drop a bottle from the 2 story. How long does she have to get out of the way? Round to the nearest tenth (A story is 12 feet).
I appreciate anyone who can help solve this problem. Thank you.
Click here to see answer by ankor@dixie-net.com(15649)

Question 153479: On planet X, an object falls 18 feet in 3 seconds. Knowing the distance it falls varies directly with the square of the time of fall, how long does it take an object to fall 100 feet? Round your answer to three decimal places
Click here to see answer by stanbon(57327)

Question 153478: Given the function f(x) = - 4x find the AVERAGE RATE of CHANGE of f from -4 to 1
Click here to see answer by stanbon(57327)

Question 153477: Is the function y = x / (x 2 - 3) EVEN, ODD or neither
Click here to see answer by stanbon(57327)

Question 153520: I tried to use the sqrt property to solve the equation. The problem is x^2=9
Will you tell me if I did this correctly?
x^2=9
x=+/-9
x=+/-3
x=3, x=3
Thanks for anyones help.
Click here to see answer by Earlsdon(6287)

Question 153519: I need help with this equation. The problem is use factoring to solve the equation. x^2-19x+88=0
Thank you for your help.
Click here to see answer by Earlsdon(6287)

Question 153526: I can't seem to get the formula right to solve problem. Can someone help?
The problem is to use the quadratic formula to solve the equation:
x^2-11x+30=0
Thanks for your help!
Click here to see answer by Fombitz(13828)

Question 153540: I have a word problem that I can't figure out. The problem reads a rectangle is 4 feet longer than it is wide, and its area is 77 square feet. Find its dimensions.
Thanks if you can help!
Click here to see answer by Fombitz(13828)

Question 153542: I am stuck on this problem. I did the equation and my answer was y=0,y=9. The problem is to use factoring to solve the equation. 2y^2-162=0
If I'm correct, yea for me!
Click here to see answer by Fombitz(13828)

Question 153541: x^2+ 4x + 8= 8x = 29
This is my problem I am having teouble figuring this out! I dont have a clue on how to do it!! if someone can tell me how to do it not just the answer!! THANX A BUNCH!!
Signed,
dnt know how to do this problem girl!
Click here to see answer by sbarbagallo(4)

Question 153699: hw do you seperate the a and x??

2-----------------2
A x +3 = 2 A
Click here to see answer by Earlsdon(6287)

Question 153754: solve by factoring quadratic equations?
3xsquare + 15=o
Click here to see answer by checkley77(12569)

Question 153860: Can someone please help me. I need to write three equations that has to be turned in tomorrow and I stuck.
Write three quadratic equations, with a, b, and c (coefficients of x^2, x, and the constant) as:
1. Integers :
2. Rational numbers:
3. Irrational numbers:
This is what I got so far not sure if its right.
1. Integers:
x^2+3x-8=0
2. Rational numbers:
1/2x^2 + 4/5x -9/13=0
3Irrational numbers:
I don't know what to put here?
As you can see I am trying to write these equation, but I been out of school for 12 years and I not sure if what I have is right.
Please help me.
Thank you so much for your help.
Jimmy

Click here to see answer by stanbon(57327)

Question 153850: write an equation to solve this problem. the service pool built a pool that was 100ft by 60ft wide. they want to built a sidewalk around the pool and had 450ft of fence. what is the maximum width that the sidewalk can be?
Click here to see answer by checkley77(12569)

Question 153816: write an equation to solve this problem.the service pool built a pool that was 100ft by 60ft wide. they want to built a sidewalk around the pool and had 450ft of fence. what is the maximum width that the sidewalk can be?
Click here to see answer by checkley77(12569)

Question 153815: the service pool built a pool that was 100ft by 60ft wide. they want to built a sidewalk around the pool and had 450ft of fence. what is the maximum width that the sidewalk can be?
Click here to see answer by checkley77(12569)

Question 153941: find the x and y intercepts f(x)=x^2-8x+2

Click here to see answer by orca(409)

Question 153942: solve by completing the square
m^2-25/2m=5/2
Click here to see answer by orca(409)

Question 153940: solve 6x+x(x-1)=0
find the x intercepts f(x)=6x+x(x-1)
Click here to see answer by Fombitz(13828)

Question 153988: Question: By increasing her usual speed by 25 kilometers per hour, a bus driver decreases the time on a 25 kilometer trip by 10 minutes. Find the usual speed.
If I set up the problem as:
25/x+25 = 25/x - 1/6
I get two seperate answers and it all depends on how I do the LCD.
the LCD which is 6x(x+25) and multiply that out I get
25(6x) = 6(x+25)(25) + x(x+25)
150x = 6x + 150 + 150 - x^2 - 25x combine like terms and I get
x^2 + 169x - 300 = 0
I can't seem to factor that one out.
the second problem:
25(6x) = 25(x+25)(6) - x(x+25)(x)
150x = 25x + 625 + 150 - x - 125 -x
150x = 23x + 650 + x^2
x^2 + 127x -650 = 0
What I am asking help on is if I even have a general idea of what to do. I am stuck at factoring them both out and unfortunatly this question is an even number so there is no solution in the manual or answer in the back of the book.
Thanks for any help :)
Click here to see answer by orca(409)

Question 154080: t2 - 6t = -5
Click here to see answer by jojo14344(1512)

Question 154082: 2x2 - 7x +3 = 0
Click here to see answer by jojo14344(1512)

Question 154078: Avoiding a Collison: A car is traveling on a road tht is perpendicular to a railroad track. When the car is 30 meters from the crossing, the car's new collision detector warns the driver that there is a train 50 meters from the car and heading toward the same crossing. How far is the train from the crossing.
Thank you
Click here to see answer by jojo14344(1512)

Question 154135: We are suppose to use the method that came from India to solve our problems, but I'm lost.
x^2-2x-13=0
x^2-2x-13+13=0
x^2-2x=13
4x^2-8x=52
4x^2-8x+4=52+4
4x^2-8x+4=56
the next step and there after I'm lost, could you please help me out
Click here to see answer by Earlsdon(6287)

Question 154065: you have thrown a baseball straight upward from a height of about 6 feet. A friend has used a stop watch to record the time the ball is in hte air. If it takes approximately 6.5 seconds before the ball strikes the ground, explain how you can find the ball's initial velocity.
Click here to see answer by ankor@dixie-net.com(15649)

Question 154169: Translate the following into a quadratic equation, and solve it: The length of a rectangular garden is three times its width; if the area of the garden is 75 square meters, what are its dimensions?
Click here to see answer by orca(409)

Question 154171: Can somebody please help me?
2. What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x2 - 10x - 42 = 0".

Click here to see answer by jim_thompson5910(28593)

Question 154175: If x=1 and x= -8 then form a quadratic equation. Could you please give me some help with this, I thought I needed to know three things to make a quadratic equation so I am confused.
Click here to see answer by Alan3354(30993)

Question 154198: this is not in a text book
400(x-1)^2=225
this is what I have
400x^2-800x+175=0
my instructions are solve for x
x= -(-800) +/- sqrt[(-800)^2 - 4(400*175)]/2(400)
x= [800+/- sqrt(640000-280000)] / 800
x= (800 +/- sqrt 360,000) /800
x= (800 +/- 1.000000001)/800
is it right up to this point? where do we go from here?
Click here to see answer by jim_thompson5910(28593)

Question 154113: What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x^2 - 10x - 42 = 0".
Click here to see answer by Alan3354(30993)

Question 154261: An open box is to be constructed from a square piece of sheet metal by removing a square of side 6 feet from each corner and turning up the edges. If the box is hold to 864 cubic feet, what should be the dimensions of the sheet metal?
Click here to see answer by checkley77(12569)

Question 154336: Hi,
Can someone please help me with the following:
I have two equations that I need to solve using the quadratic equation but, I really having problems solving them.
1. 5/6x^2-7x-6/5=0

2. 3^1/2y^2-4y-7(3)^1/2=0
Thank you so much, I am sorry for being so much trouble but I been out of school for 15 years.
Jimmy
Click here to see answer by jim_thompson5910(28593)

Question 154331: The number of tickets sold each day for an upcoming performance of Handel's Messiah is given by N(x)=-0.5x^2+14x+10, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that day?
Click here to see answer by scott8148(6628)

Question 154368: how do you write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form.
ax^2+bx+c=0
Soution 8, only solution
x=8
x-8(x) Will I use the distributive law?
Thank you for your help!
Click here to see answer by jim_thompson5910(28593)

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