Algebraeasy · Past Paper
Which of the following is equal to (x+y)^2 - (x-y)^2?
A2x^2 + 2y^2
B4xy
C0
D2xy
✓ Correct Answer: B — 4xy
Using (a^2-b^2), we get [(x+y)+(x-y)][(x+y)-(x-y)] = (2x)(2y) = 4xy.
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