G(a)=a-2 f(a)=2a+2 find g(a)•f(a)

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asked Aug 7, 2022 97.8k views

3 votes

G(a)=a-2
f(a)=2a+2
find g(a)•f(a)

Mathematics
high-school

Saraford asked

by Saraford

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2 Answers

7 votes

Answer:

$g(a).f(a) = (a - 2)(2a + 2) \\ = 2 {a}^(2) + 2a - 4a - 4 \\ = \boxed{2 {a}^(2) - 2a - 4}$

(2a²-2a-4) is the right answer.

Ken Lee answered Aug 7, 2022

by Ken Lee

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3 votes

Answer:

$(a - 2)(2a + 2) \\ = {2a }^(2) + 2a - 4a - 4 \\ = {2a}^(2) - 2a - 4 \\ ({2a}^(2) - 4a) + (2a - 4) \\ 2a(a - 2) + 2(a - 2) \\( a - 2)(2a + 2) \\ a = 2 \\ a = - 1$

Andrew Rhyne answered Aug 11, 2022

by Andrew Rhyne

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(2a²-2a-4) is the right answer.

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