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If 3t3 - 7 = 74, what is t2- t?
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19 May 2018, 15:06
19 May 2018, 15:06
Expert Reply
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Question Stats:
36% (00:40) correct
64% (00:49) wrong based on 25 sessions
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If \(3t^3 - 7 = 74\), what is \(t^2- t\)?
(A) -3
(B) 3
(C) 6
(D) 9
(E) 18
(A) -3
(B) 3
(C) 6
(D) 9
(E) 18
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
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Re: If 3t3 - 7 = 74, what is t2- t?
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27 Dec 2018, 09:29
27 Dec 2018, 09:29
sandy wrote:
If \(3t^3 - 7 = 74\), what is \(t^2- t\)?
(A) -3
(B) 3
(C) 6
(D) 9
(E) 18
(A) -3
(B) 3
(C) 6
(D) 9
(E) 18
GIVEN: 3t³ - 7 = 74
Add 7 to both sides: 3t³ = 81
Divide both sides by 3 to get: t³ = 27
Solve: t = 3
So, t² - t = 3² - 3
= 9 - 3
= 6
Answer: C
Cheers,
Brent
gmatclubot
Re: If 3t3 - 7 = 74, what is t2- t? [#permalink]
27 Dec 2018, 09:29
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