SOLUTION: I need to solve this by factoring and I'm terrible at factoring. {{{ x^2+x-72=0 }}} My options are: A)8,-9 B)-8,9 C)-8,-9 D)8,9

Algebra ->  College  -> Linear Algebra -> SOLUTION: I need to solve this by factoring and I'm terrible at factoring. {{{ x^2+x-72=0 }}} My options are: A)8,-9 B)-8,9 C)-8,-9 D)8,9      Log On


   

Question 328245: I need to solve this by factoring and I'm terrible at factoring.
+x%5E2%2Bx-72=0+
My options are: A)8,-9
B)-8,9
C)-8,-9
D)8,9
E)prime equation, cannot be factored
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
x^2+x-72=0

x^2+9x-8x-72=0

x(x+9)-8(x+9)=0

(x-8)(x+9)=0

x-8=0 or x+9=0

x=8 or x=-9