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Which expression can be written as a product of two binomials?

Answer and explanation

Correct answer: x² − 16

The correct answer is B: x² − 16. This is the difference of two perfect squares: x² − 16 = x² − 4². Using a² − b² = (a − b)(a + b), we obtain x² − 16 = (x − 4)(x + 4), a product of two binomials. Option A is a sum of squares, x² + 3², and the difference-of-squares identity does not apply. Option C can be written as (x + 4)² + 1, so it is not a product of two real binomials in the intended school-level factorisation. Option D becomes (x + 2)² + 1, so it also has no real binomial factorisation of this type. Notice that B has two square terms separated by a minus sign and no middle term. Memory cue: difference of squares needs two perfect squares with subtraction; a plus sign is not interchangeable with a minus sign.

Related tags

Difference Of SquaresFactorisationAlgebraic IdentitiesBinomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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