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What is the simplest form of \(4\sqrt{2}+5\sqrt{2}\)?

Answer and explanation

Correct answer: \(9\sqrt{2}\)

Both terms contain the same surd, \(\sqrt{2}\), so their coefficients can be added: \(4\sqrt{2}+5\sqrt{2}=(4+5)\sqrt{2}=9\sqrt{2}\). Option A uses an incorrect sum of coefficients. Option C equals \(9\sqrt{4}=18\), while option D simplifies to \(\sqrt{18}=3\sqrt{2}\), so neither is correct. Exam tip: coefficients can be added or subtracted only when the surd parts are identical.

Related tags

Real NumbersLike SurdsSurd AdditionSimplificationNumber SystemsMathematicsClass 9 Mcq

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