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(x+3)(x-4)

Guest Mar 7, 2017
 #1
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Expand the following:
(x + 3) (x - 4)

(x + 3) (x - 4) = (x) (x) + (x) (-4) + (3) (x) + (3) (-4):
x x + 3 x - 4 x - 4 3

x x = x^2:
x^2 + 3 x - 4 x - 4 3

-4×3 = -12:
x^2 + 3 x - 4 x + -12

3 x - 4 x = -x:
Answer: |x^2 - x - 12

Guest Mar 7, 2017

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