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Write 5x^2 + 16x + 3 in factors.

Answer and explanation

Correct answer: (5x + 1)(x + 3)

The correct answer is A: (5x + 1)(x + 3). Multiply the proposed factors carefully: (5x + 1)(x + 3) = 5x·x + 5x·3 + 1·x + 1·3 = 5x^2 + 15x + x + 3 = 5x^2 + 16x + 3. The leading term and constant term are correct, and the two cross-products combine to give the required 16x. Option B expands to 5x^2 + 5x + 3x + 3 = 5x^2 + 8x + 3, so its middle term is too small. Option C expands to x^2 + 8x + 15, which has the wrong leading and constant terms. Option D expands to 5x^2 − 15x − x + 3 = 5x^2 − 16x + 3, so the middle sign is wrong. Memory cue: for two binomials, check the first product, the last product, and then add the two cross-products to test the middle term.

Related tags

Quadratic-FactorisationBinomial-ProductsMiddle-Term-CheckFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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