GMAT Quantitative Reasoning Practice Test 2

Question : 49 of 100

Marks: +1, -0

A^2+B^2=15

and

A B=10

, what is the value of the expression

(A

-B)^2+(A+B)^2

Solution:

(A-B)^2+(A+B)^2=A^2-2 A B+B^2+A^2+2 A B+B^2=2 (A^2+B^2) =30

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