SOLUTION: Factor (x + 1)( x - 5) = 16

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Factor (x + 1)( x - 5) = 16      Log On


   

Question 313670: Factor (x + 1)( x - 5) = 16
Found 2 solutions by texttutoring, Fombitz:
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
Do FOIL on the left side.

x^2 -5x + x -5 = 16
x^2 -4x - 21 = 0

Now ask yourself what two numbers multiply to -21 and have a difference of -4? -7 and 3.

x^2 -4x - 21 = 0
(x-7)(x+3)=0

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
+%28x%2B1%29%28x-5%29+=+16
+x%5E2-4x-5=+16
x%5E2-4x-21=0
%28x-7%29%28x%2B3%29=0
Two solutions:
x-7=0
highlight%28+x=7%29
.
.
.
x%2B3=0
highlight%28+x=-3%29