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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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Kudos [?]: 135613 [0], given: 12705

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

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New post 24 Oct 2017, 00:33
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

92% (00:40) correct 8% (01:41) wrong based on 59 sessions

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Kudos [?]: 135613 [0], given: 12705

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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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New post 24 Oct 2017, 00:42
I choose (A)

First, I start with S(3,4).
S(3,4) = 9-16 = -7

Then, S(3,S(3,4)) = S(3,-7)
S(3,-7) = 9-49 = -40
_________________

I would like to practice my English skill and GMAT, Please advise if I am incorrect. Thanks in advance!

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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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New post 24 Oct 2017, 19:10
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

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Re: Given that x and y are real numbers, let S(x, y) = x^2 – y^2. Then S(3   [#permalink] 24 Oct 2017, 19:10
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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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