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Expand $(x + 5)^2$.

A$x^2 + 10x + 10$
B$x^2 + 5x + 25$
C$x^2 + 25$
D$x^2 + 10x + 25$
Answer & Solution
Correct answer: D. $x^2 + 10x + 25$
$(a+b)^2 = a^2 + 2ab + b^2$. With $a=x, b=5$: $x^2 + 10x + 25$.
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