alleryExpand the trinomial (a + b + c)^2.
Aa^2+b^2+c^2+2(ab+bc+ca)
Ba^2+b^2+c^2+(ab+bc+ca)
Ca^2+b^2+c^2+4(ab+bc+ca)
Da^2+b^2+c^2-2(ab+bc+ca)
Answer & Solution
Correct answer: A. a^2+b^2+c^2+2(ab+bc+ca)
Squaring a trinomial results in the sum of squares plus twice each pairwise product.
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