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If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(
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12 Mar 2021, 10:11
12 Mar 2021, 10:11
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If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(3), in terms of k?
(A) 1
(B) k
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
(A) 1
(B) k
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
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Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(
[#permalink]
12 Mar 2021, 10:33
12 Mar 2021, 10:33
1
Carcass wrote:
If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(3), in terms of k?
(A) 1
(B) k
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
(A) 1
(B) k
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Given: f(x) = k(x - k)
So, for example, f(9) = k(9 - k) = 9k - k²
The question asks for the value of f(4) - f(3)
f(4) - f(3) = [k(4 - k)] - [k(3 - k)]
= [4k - k²] - [3k - k²]
= k
Answer: B
Cheers,
Brent
gmatclubot
Re: If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f( [#permalink]
12 Mar 2021, 10:33
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