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# What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ?

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What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ? [#permalink]  19 Jun 2017, 11:57
Expert's post
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Difficulty:

5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ?

A) –64

B) –16

C) 0

D) 16

E) 64
[Reveal] Spoiler: OA

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Re: What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ? [#permalink]  20 Jun 2017, 08:21
Expert's post
Carcass wrote:

What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ?

A) –64

B) –16

C) 0

D) 16

E) 64

Take (4 + a)(4 – b) and replace a with 4, and replace b with -4

We get: (4 + a)(4 – b) = (4 + 4)(4 – -4)
= (8)(8)
= 64

[Reveal] Spoiler:
E

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Re: What is the value of (4 + a)(4 – b) when a = 4 and b = –4 ?   [#permalink] 20 Jun 2017, 08:21
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