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# If t = –5k, what is t² – 2t in terms of k ?

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Manager
Joined: 17 Mar 2018
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If t = –5k, what is t² – 2t in terms of k ?  [#permalink]

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Updated on: 10 Oct 2018, 18:57
00:00

Difficulty:

5% (low)

Question Stats:

91% (00:36) correct 9% (01:30) wrong based on 75 sessions

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If t = –5k, what is t² – 2t in terms of k ?

A) 25k² + 10k

B) 25k² – 10k

C) 5k² + 10k

D) –5k² + 10k

E) –5k² – 10k

Originally posted by taniad on 10 Oct 2018, 03:04.
Last edited by generis on 10 Oct 2018, 18:57, edited 1 time in total.
Formatted the question
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Re: If t = –5k, what is t² – 2t in terms of k ?  [#permalink]

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10 Oct 2018, 03:07
OA:A
Given : $$t = –5k$$
$$t² – 2t = (-5k)^2-2(-5k) =25k^2+10k$$
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Re: If t = –5k, what is t² – 2t in terms of k ?  [#permalink]

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10 Oct 2018, 08:37
If $$t = –5k$$, what is $$t^2 – 2t$$ in terms of k ?

25k² + 10k

25k² – 10k

5k² + 10k

–5k² + 10k

–5k² – 10k

$$t^2 – 2t = (–5k)^2 -2(–5k)$$

Or, $$t^2 – 2t = 25k^2 + 10k$$; Answer must be (A)
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Re: If t = –5k, what is t² – 2t in terms of k ?  [#permalink]

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13 Oct 2018, 18:30
If t = –5k, what is t² – 2t in terms of k ?

A) 25k² + 10k

B) 25k² – 10k

C) 5k² + 10k

D) –5k² + 10k

E) –5k² – 10k

Substituting,, we have:

(-5k)^2 - 2(-5k) = 25k^2 + 10k

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Re: If t = –5k, what is t² – 2t in terms of k ?  [#permalink]

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15 Oct 2018, 03:51
We know t = -5k
t² – 2t = (-5k)² - 2(-5k) = 25k² + 10k

Re: If t = –5k, what is t² – 2t in terms of k ?   [#permalink] 15 Oct 2018, 03:51
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