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What will be the factorisation of (16a²−25b²)?

Answer and explanation

Correct answer: (4a−5b)(4a+5b)

The direct answer is C: (4a−5b)(4a+5b). First identify the two square terms: 16a²=(4a)² and 25b²=(5b)². Therefore, 16a²−25b² has the form A²−B², where A=4a and B=5b. Applying A²−B²=(A−B)(A+B) gives 16a²−25b²=(4a−5b)(4a+5b). Option A is the square of a binomial; expanding it gives 16a²−40ab+25b², which has the wrong signs and a middle term. Option B gives 16a²+40ab+25b², also incorrect. Option D does not complete the factorisation and, when expanded, simply retains the original structure. Check the answer by multiplying the two conjugate factors: the mixed terms cancel.

Related tags

FactorisationDifference Of SquaresPerfect SquaresAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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