If (A-B-C-D=13) and (A+B-C-D=5), what is the value of (B-D)^2 ?

GMAT Quantitative Reasoning Practice Test 4

Question : 32 of 100

Marks: +1, -0

(A-B-C-D=13)

and

(A+B-C-D=5)

, what is the value of

(B-D)^2

Solution:

Subtract equation 2 from equation 1 and you'll get:

-2 B+2 D=8 →(B-D)^2=16

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