Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 111223: I am graphing a parabola and I have all of my points done but I'm having a problem getting the x & y vertex's....the equation is 3x�-x-1=0 ...I have 1.5 for x but I'm told this is wrong and I have no idea how to solve it for the y vertex. Please help!
Thanks so much!
B. Cook
Click here to see answer by solver91311(24713)

Question 111372: x^2-9=0
Click here to see answer by jim_thompson5910(35256)

Question 111375: y^2-5y=0
Click here to see answer by jim_thompson5910(35256)

Question 111371: x2-9=0
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Question 111370: Given 3 sides of a rectangular fence have a perimeter of 80 feet. Find the largest possible area.
Click here to see answer by jim_thompson5910(35256)

Question 111116: solve by factoring
1. x^2 +7x+10=0
2 3x^2-6x=0

only two problems to solve. need help
Click here to see answer by jim_thompson5910(35256)

Question 111378: The altitude of a triangle is 3 inches more than its base. What are the dimensions if the area of the triangle is 29 square inches?
Click here to see answer by edjones(8007)

Question 111386: Show and explain your steps using the quadratic formula.
2x^2-3x-2=0
Thank you for your time and help!
Click here to see answer by HyperBrain(694)

Question 111414: Could you please help me with an application using a quadratic equation?
The question is: The width of a rectangular parking lot is 51 ft less than its length. Determine the dimensions of the parking lot if it measures 250 ft diagonally.
What I've got so far:
x^2+(x-51)^2=250^2
x^2+x^2-102x+2601=62500
2x^2-102x-59899=0
factor out 2
x^2-51x-29949.5=0
I stopped there because I got a decimal number (29949.5) and that seems wrong.
Please help!
Thank you in advance!
Brenda
Click here to see answer by Earlsdon(6294)

Question 111413: Could you please help me with this application using a quadratic equation?
W=sqrt1/(LC) solve for L (an electricty formula)
I honestly don't even know where to begin...please help!
Thank you in advance!
Brenda
Click here to see answer by Earlsdon(6294)

Question 111421: Could you please help me with an application question involving a quadratic equation?
The question is: On a sales trip, Gail drives the 600 mi to Richmond at a certain speed. The return trip is made at a speed that is 10 mph slower. Total time for the round trip is 22 hr. How fast did Gail travel on each part of the trip?
This is what I've got so far:
t[1]=600/r
t[2]=600/(r-10)
(600/r)+(600/(r-10))=22
r(r-10)(600/r)+r(r-10)(600/(r-10))=r(r-10)22
600(r-10)+600r=22r(r-10)
600r-6000+600r=22r^2-220r
22r^2-1420r+6000=0
I know at this point to plug it into quadratic equation form... but when factoring this I get decimal numbers, so it seems wrong.
-(-64.545)+-(sqrt(-64.545)^2-4(1)(272.727))/2(1)
64.545+-(sqrt4166.057-1090.908)/2
64.545+-(sqrt3075.149)/2
(64.545+55.454)/2=60
or
(64.545-55.454)/2=4.5
Please help!
Thank you in advance for your help!
Brenda
Click here to see answer by jim_thompson5910(35256)

Question 111423: I am having trouble with all five of these quadratic equations PLEASE HELP!
1.
2.
3.
4.
5.
Any help would be greatly appreciated. I am going to continue working on these problems. They are due today by 4:30 p.m. est.
Click here to see answer by jim_thompson5910(35256)

Question 111388: How do I write a quadratic equation for a parabola given the vertex and the y-intercept?
I am also attempting to determine the values of "a" and "b" in the equation.
Ordered pairs are as follows:
(0,53)- y-intercept
(2,35)- vertex
(4,42)
(6,54)
(8,82)
My textbook ISBN is 0-13-175204-9
Thanks in advance!
Click here to see answer by scott8148(6628)

Question 111478: I am needing to find a real-life application of a quadratic function. I cannot use any version of projectile motion. I am having a really difficult time with this someone please please help
Click here to see answer by Fombitz(32388)

Question 111481: how do you write the quadratic equation: y=-2x^2-12x+11 in standard form?
Click here to see answer by solver91311(24713)

Question 111482: state the maximum or minimum value of the quadratic function and name the x-value at which this occurs: f(x)=-2 (x+1)^2-5
Click here to see answer by jim_thompson5910(35256)

Question 111412: Could you please help me with this application involving a quadratic equation?
s=v[0]t+(gt^2)/2 solve for t (a motion formula)
First I got rid of the fraction by mulitplying the equation by 2
2s=2v[0]t=gt^2
2s/2v[0]t-g=t^2
sqrt 2s/2v[0]t - g = sqrt t^2
sqrt 2s/2v[0]t - g = t
I have a feeling I'm completely off... but I tried. Please help!
Thank you in advance!
Brenda
Click here to see answer by Fombitz(32388)

Question 111500: For the following function, tell where the function is increasing and decreasing. What is the concavity? Give the coordinates of the vertex and the equation of the axis of symmetry. f(x)= -3(x+2)^2+3
Click here to see answer by checkley71(8403)

Question 111502: find the slope and y intercept of the line -3x+2y-6=0
Click here to see answer by checkley71(8403)

Question 111497: State the minimum or maximum value for the quadratic function and name the x value at which this occurs: f(x)-2^2-6+5
Click here to see answer by solver91311(24713)

Question 111571: Use the quadratic formula to solve the equation.
3x^2-5x-7=0
Click here to see answer by jim_thompson5910(35256)

Question 111625: If the area of a rectangle is 2x(squared)+11x+5 what is the length and width and how do you get it?
Click here to see answer by checkley71(8403)

Question 111625: If the area of a rectangle is 2x(squared)+11x+5 what is the length and width and how do you get it?
Click here to see answer by FadelSalem(12)

Question 111626: If the area of a rectangle is 2x(squared)+11x+5 what is the length and width and how do you get it?
Click here to see answer by checkley71(8403)

Question 111604: Will you please help me solve the following quadratic equation?
m=(m[0])/sqrt(1-(v^2/c^2)) solving for c
This is what I've attempted...
multiply both sides by the LCM sqrt1-(v^2/c^2)to get rid of the fraction
(m)qrt1-(v^2/c^2)=m[0]
then multiply both sides again to get rid of the fraction in the sqrt?
(mc^2)sqrtc^2-v^2=m[0]
then divide both sides by (m)sqrt(c^2-v^2)
c^2=(m[0])/(m)sqrt(c^2-v^2)
square both sides with a final answer of
c=sqrt(m[0])/(m)sqrt(c^2-v^2)
Thank you in advance for your help!!
Brenda

Click here to see answer by stanbon(75887)

Question 111713: please help me to solve this equation
Click here to see answer by MathLover1(20849)

Question 111727: For what values of k does the equation 2x squared + (1-k)x+8=0 have a double root? I have tried numerous ideas, but cannot figure this out.
Click here to see answer by scott8148(6628)

Question 111767: can someone please help me.
A. Find the corresponding y values for x=-2,-1,0,1,2,3,if y=x^2-x-2
answer(fill in y column)
x_____________y
-2
-1
0
1
2
3
B. use microsoft exel to plot the points found in part A and to sketch the graph.
Click here to see answer by jim_thompson5910(35256)

Question 111796: I have a rectangular pen with an area of 2400 square meters. I remember that the width of the pen is 20 meters greater than the length. Find the length and width of the rectangular pen. I used the formula Let w = the width; Let w + 3 = the length; Area = lw and the instructor said that it was not a proper function because it only contained one variable. What am I doing wrong?

Click here to see answer by MathLover1(20849)

Question 111749: Use the graph of y=-x^+4x+5 to answer the following:
-x^+4x+5=0 explain how you obtain your answers by looking at the graph:
Does this function have a maximum or minimum?
I do not understand how to look at a graph and tell anything -
Click here to see answer by ankor@dixie-net.com(22740)

Question 111790: x squared+4x-3=0
Click here to see answer by jim_thompson5910(35256)

Question 111852: Find the roots of 2x to the second power-5x+1=0
Click here to see answer by jim_thompson5910(35256)

Question 111872: Determine whether the graph of each parabola opens upward or downward.
y=-1/2x2+3
Click here to see answer by checkley71(8403)

Question 111875: Find the vertex and intercepts. Sketch the graph.

g(x)=x^2+x-6
Click here to see answer by checkley71(8403)

Question 111874: Determine whether the graph of each parabola opens upward or downward.
y=-1/2x2+3
Are the ordered pairs x=-3 and 2 1/2 and y=3 and -10?
Click here to see answer by MathLover1(20849)

Question 111876: This one has me stumped on how to start. Given the formula A=p(1+r/t)^nt, answer the following problem: Find r given (A)=$95375, (p)=$65,750, and t=15 years with interest compounded monthly. Here's the formula I had after I plug every thing in to the formula: $95375 = $65750 (1+r/12)^(12*15 or 180)
How do I start solving for r?
Click here to see answer by jim_thompson5910(35256)

Question 111879: Someone PLEASE help me! I am solving and graphing parabolas and I just dont understand the steps involved....I also need to graph each one and find the vertex's and intercepts?? I dont know what to do first...no has explained this to me so I can understand. Here is an example of what I am working on: f(x)=-3x^2 + x -5
I would appreciate any help!
Thanks so much!
Bonnie Cook
Click here to see answer by jim_thompson5910(35256)

Question 111699: The path of a falling object is given by the function s = -16t + vt + st where v represents the initial velocity in ft/sec and s represents the initial height in feet.
A.) If a rock is thrown upward with an initial velocity of 64 feet per second from the top of a 25-foot building, write the height (s) equation using this information.
B.) How high is the rock after 1 second?
C.) After how many seconds will the graph reach maximum height?
D.) What is the maximum height?
Click here to see answer by scott8148(6628)

Question 111947: the product of two consecutive positive integers is 306. we need to find the integers
Click here to see answer by ankor@dixie-net.com(22740)

Question 111946: How do I find out the graphing for -x^2+4x+5=0
Click here to see answer by checkley71(8403)

Question 112101: x2+7x+10=0 I guess
Click here to see answer by jim_thompson5910(35256)

Question 112228: Here is the problem: Suppose you are tossing an apple up to a friend on a third-story balcony. After x seconds, the height of the apple in feet is given by h=-16x(squared)+38.4x+0.96. Your friend catches the apple just as it reaches its highest point. How long does it take for the apple to reach your friend, and at what height above the ground does your friend catch it.
I tried doing:
-38.4/2(-16)= 6/5
Then i plugged 6/5 into the equation and got 24. I do not know where to go from there. Thank you!
Click here to see answer by ankor@dixie-net.com(22740)

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