MathRevolution wrote:
[
Math Revolution GMAT math practice question]
\((\sqrt{7+4√3}+\sqrt{7-4√3})^2\) is equal to which of the following?
\(A. 32\)
\(B. 30\)
\(C. 24\)
\(D. 16\)
\(E. 12\)
just a question of \((a+b)^2\) and a\(^2 - b ^2\) = (a-b) (a+b)
= 7+4√3+7-4√3 + 2 *\(\sqrt{7+4√3}\) * \(\sqrt{7-4√3}\)
= 14 + 2
Ans D.
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