SOLUTION: x² – 13x – 5 = 0 I need to solve this by completing the square.Which I think I have done? I also need to solve it graphically using the intersections of two equations. I'm not whic
Algebra.Com
Question 623440: x² – 13x – 5 = 0 I need to solve this by completing the square.Which I think I have done? I also need to solve it graphically using the intersections of two equations. I'm not which two equations to use or how the intersction will help me find the solution?
Here is my work: completing the square
x² – 13x – 5 = 0
(x² -13x + 169/4)-5- 169/4 = 0
(x-13/2)(x-13/2)- 147/4 =0
(x- 13/2)² - 147/4 =0
(x- 13/2)² = 147/4 Take the square root of both sides
x- 13/2 = +- the square root of 147/4
x= +- the square root of 147/2 + 13/2
Is this right? I feel like I'm missing something or doing something wrong.
Thanks for all of the help!
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
x² – 13x – 5 = 0 I need to solve this by completing the square.Which I think I have done? I also need to solve it graphically using the intersections of two equations. I'm not which two equations to use or how the intersction will help me find the solution?
Here is my work: completing the square
x² – 13x – 5 = 0
(x² -13x + 169/4)-5- 169/4 = 0
(x-13/2)(x-13/2)- 147/4 =0 ************** c = -189/4
(x- 13/2)² - 147/4 =0
(x- 13/2)² = 147/4 Take the square root of both sides
x- 13/2 = +- the square root of 147/4
x= +- the square root of 147/2 + 13/2
Is this right? I feel like I'm missing something or doing something wrong.
Thanks for all of the help!
-----------
It's correct except for the -147/4
Put the c on the right side early, makes it simpler.
etc
RELATED QUESTIONS
I need to solve x^2+6x-16=0 by completing the... (answered by jim_thompson5910)
x^2+3x=28. I need help to solve this problem by completing the... (answered by lenny460)
36x^2+18x+1=0 I need help to solve by completing the... (answered by solver91311)
I am supposed to "Solve each quadratic equation by completing the square. Leave your... (answered by Earlsdon,solver91311)
Hello Tutor,
I am in need of some help if you can help me out I would appreciate it. (answered by edjones)
Please help with this! I need to solve by completing the square:
3x^2 -2x = 0
and... (answered by ankor@dixie-net.com)
I am supposed to solve this problem by completing the square:
(x squared) + 11x +... (answered by LifeDeathnCandy)
I am taking college Algebra for the first time and since math has always been my worst... (answered by yhtong)
i am doing completing the square and i want to make sure i have it right
solve: x... (answered by stanbon,Earlsdon,meay7c)