SOLUTION: Please show me how to solve: x^2=8x-5 I know I have to use the quadratic formula, but I can't figure it out.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: Please show me how to solve: x^2=8x-5 I know I have to use the quadratic formula, but I can't figure it out.      Log On


   

Question 630037: Please show me how to solve:
x^2=8x-5
I know I have to use the quadratic formula, but I can't figure it out.
Found 2 solutions by ewatrrr, solver91311:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

x^2=8x-5    ||  Set to zero and follow the same quadratic formula format from there

x^2 - 8x +5 = 0

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ 

x+=+%288+%2B-+sqrt%28+64-4%2A1%2A5+%29%29%2F2+

 x+=+%288+%2B-+sqrt%2844%29+%29%2F2+ 

 x+=+%288+%2B-+sqrt%284%2A11%29+%29%2F2+

  x+=+%288+%2B-+2sqrt%2811%29+%29%2F2+ 

  x+=+4+%2B-+sqrt%2811%29+ 

use Your calculator if decimal form is requested

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


First put it into standard form. The coefficients don't make sense in the quadratic formula unless the equation is in the form:



So:




then just plug in your coefficients into the quadratic formula and do the indicated arithmetic:



where:

, , and

John

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