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What is the simplified form of ( (6-\sqrt{8})^2 )?

Answer and explanation

Correct answer: (44-24\sqrt{2})

The direct answer is option B: \(44-24\sqrt{2}\). Start with \((a-b)^2=a^2-2ab+b^2\). Here \(a=6\) and \(b=\sqrt{8}\), so \((6-\sqrt{8})^2=36-12\sqrt{8}+8=44-12\sqrt{8}\). Since \(\sqrt{8}=2\sqrt{2}\), this becomes \(44-24\sqrt{2}\). Option A keeps \(\sqrt{8}\) and has the wrong middle term. Option B is correct after simplification. Option C has an incorrect constant term and radical coefficient. Option D incorrectly treats the cross product as involving \(\sqrt{6}\). Remember: square the first term, subtract twice the product, then square the second term.

Related tags

Real NumbersAlgebraic IdentitySurds

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