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If h(x) = 2x3 – 3 and h(m) = –19, what is the value of m?
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sandy
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Joined: 07 Jun 2014
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GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
If h(x) = 2x3 – 3 and h(m) = –19, what is the value of m? [#permalink] New post  25 Jul 2018, 17:10
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86% (00:29) correct 13% (02:17) wrong based on 29 sessions

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If \(h(x) = 2x^3 - 3\) and \(h(m) = -19\), what is the value of m?

(A) –3
(B) –2
(C) 2
(D) 6,856
(E) 6,862
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sandy
Retired Moderator
Joined: 07 Jun 2014
Posts: 4804
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Re: If h(x) = 2x3 – 3 and h(m) = –19, what is the value of m? [#permalink] New post  31 Jul 2018, 14:15
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Explanation

Be careful with the notation here. The problem indicates that \(h(m) = -19\), not that \(h(-19) =\) something else. Do not plug –19 in for x; rather, plug m in for x and set the answer equal to –19:

\(2m^3 - 3 = -19\)
\(2m^3 = -16\)
\(m^3 = -8\)
\(m = –2\)

Hence option B i correct!
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