SOLUTION: Please show me how to solve: x^2+8x=12 I know I have to use the quadratic formula, but I can't figure it out.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Please show me how to solve: x^2+8x=12 I know I have to use the quadratic formula, but I can't figure it out.      Log On


   

Question 630039: Please show me how to solve:
x^2+8x=12
I know I have to use the quadratic formula, but I can't figure it out.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

x^2+8x=12

x^2 + 8x -12 = 0

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

x+=+%28-8+%2B-+sqrt%28+64-4%2A1%2A%28-12%29+%29%29%2F2+

 x+=+%28-8+%2B-+sqrt%28+112%29+%29%2F2+ 

 x+=+%28-8+%2B-+sqrt%28+16%2A7%29+%29%2F2+

  x+=+%28-8+%2B-+4sqrt%287%29+%29%2F2+ 

  x+=+-4+%2B-+2sqrt%287%29+ 

use Your calculator if decimal form is requested