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If m = 3^2 × 5^2, what is the value of m?

Answer and explanation

Correct answer: 225

The governing idea is evaluating each power in a factorised numerical expression and then multiplying the results. Here, 3^2 = 3 × 3 = 9 and 5^2 = 5 × 5 = 25. Therefore m = 9 × 25 = 225. Option A is correct. Another efficient check is to group equal exponents: 3^2 × 5^2 = (3 × 5)^2 = 15^2 = 225, using the law a^n b^n = (ab)^n. Option B is too small and reflects an incorrect calculation, while 300 and 450 do not follow from the stated factors. The prime factorisation of 225 is 3^2 × 5^2, confirming the answer independently.

Related tags

Prime FactorisationPower LawsExpression EvaluationReal NumbersChapter 1 Real NumbersMathematicsClass 10 Mcq

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