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If a = 7 and b = -7, what is the value of 2a - 2b + b^2 ?

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Joined: 06 Sep 2018
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If a = 7 and b = -7, what is the value of 2a - 2b + b^2 ?  [#permalink]

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New post 08 Sep 2018, 09:25
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E

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Question Stats:

90% (00:29) correct 10% (00:04) wrong based on 29 sessions

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If \(a = 7\) and \(b = -7\), what is the value of \(2a - 2b + b^2\) ?

(A) -49
(B) 21
(C) 49
(D) 63
(E) 77

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Re: If a = 7 and b = -7, what is the value of 2a - 2b + b^2 ?  [#permalink]

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New post 08 Sep 2018, 09:31
Hasnain786 wrote:
If \(a = 7\) and\(b = -7\), what is the value of \(2a - 2b + b^2\) ?

(A) -49
(B) 21
(C) 49
(D) 63
(E) 77


a=7, b=-7
\(2a - 2b + b^2\) = 2x7-2x(-7)+(-7)^2 = 14+14+49 = 77
Answer E.
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Re: If a = 7 and b = -7, what is the value of 2a - 2b + b^2 ?  [#permalink]

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New post 08 Sep 2018, 10:15
Hasnain786 wrote:
If \(a = 7\) and\(b = -7\), what is the value of \(2a - 2b + b^2\) ?

(A) -49
(B) 21
(C) 49
(D) 63
(E) 77


\(2a - 2b + b^2\)

\(= 2a - b ( 2 - b)\)

\(= 2*7 + 7 ( 2 + 7)\)

\(= 14 + 7 *9\)

\(= 14 + 63\)

\(= 77\), Answer must be (E)
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Re: If a = 7 and b = -7, what is the value of 2a - 2b + b^2 ? &nbs [#permalink] 08 Sep 2018, 10:15
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