Given that x and y are real numbers, let s (x,y)=x2-y2 then S{3,S(3,4)}=?

A    -7

B    -40

C    56

D    49

Solution

Correct Answer: Option B

 

s(3,4)=32 -42 = 9-16=-7 s{3,s(3,4)}=(3,-7) =9-49=-40

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