alleryWhich algebraic expression is identically equal to (a - b)^2?
A(a + b)^2 - 2ab
B(a + b)^2 - 4ab
C(a + b)^2 + 4ab
D(a + b)^2 + 2ab
Answer & Solution
Correct answer: B. (a + b)^2 - 4ab
Expanding the right side gives a^2 + 2ab + b^2 - 4ab = a^2 - 2ab + b^2, which equals (a - b)^2.
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