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What is obtained by taking out the common factor from 5p + 15q?

Answer and explanation

Correct answer: 5(p + 3q)

The direct answer is A: 5(p + 3q). Look for a factor present in every term. The numerical coefficients are 5 and 15, and their greatest common factor is 5. The variables p and q are different, so no variable is common to both terms. Divide each term by 5: 5p ÷ 5 = p and 15q ÷ 5 = 3q. Hence 5p + 15q = 5(p + 3q). Verify by distributing: 5·p + 5·3q = 5p + 15q. Option B expands to 5p + 75q, so the second term is incorrect. Option C incorrectly treats p as common even though the second term contains q, not p. Option D uses 15, but 15 cannot be taken from 5p because 5 is not divisible by 15. Memory cue: a common factor must divide every term exactly.

Related tags

Common FactorFactorisationLinear ExpressionDistributive PropertyExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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