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# Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3

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Math Expert
Joined: 02 Sep 2009
Posts: 50000
Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3  [#permalink]

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24 Oct 2017, 01:33
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Difficulty:

15% (low)

Question Stats:

88% (00:58) correct 12% (01:32) wrong based on 87 sessions

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Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3, S(3, 4)) =

(A) –40
(B) –7
(C) 40
(D) 49
(E) 56

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Intern
Joined: 23 Oct 2017
Posts: 5
Re: Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3  [#permalink]

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24 Oct 2017, 01:42
I choose (A)

S(3,4) = 9-16 = -7

Then, S(3,S(3,4)) = S(3,-7)
S(3,-7) = 9-49 = -40
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I would like to practice my English skill and GMAT, Please advise if I am incorrect. Thanks in advance!

Intern
Joined: 16 Feb 2017
Posts: 7
Concentration: General Management, Social Entrepreneurship
Re: Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3  [#permalink]

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24 Oct 2017, 20:10
Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3, S(3, 4)) =

Sol- To start with, S(3,4)= -7 . Putting value in exp S(3,S(3,4))= S(3,-7)= 3^2- (-7)^2= 9-49=-40. Ans - A
Re: Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3 &nbs [#permalink] 24 Oct 2017, 20:10
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# Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3

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