Question

Is the answer A,B,C, or D?

Answer 1

The answer should be D.

Explanation:

(x - 3)(x + 7)

= x² - 3x + 7x - 21 (using the FOIL technique)

= x² + 4x - 21

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Answer 2

x^2 +4x-21

Explanation:

(x-3) (x+7)

FOIL

first x*x = x^2

outer: 7x

inner: -3x

last: -3*7=-21

Add them together

x^2 +7x-3x -21

x^2 +4x-21