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Simplify ( (4x-3)(4x+3)+9 ).

Answer and explanation

Correct answer: (16x^2)

The direct answer is option B: \(16x^2\). This is an opposite-sign pair, so use \((a-b)(a+b)=a^2-b^2\). Taking \(a=4x\) and \(b=3\), \((4x-3)(4x+3)=(4x)^2-3^2=16x^2-9\). The extra \(+9\) cancels the \(-9\): \(16x^2-9+9=16x^2\). Option A stops before adding the final 9, so it is incomplete. Option B includes the cancellation and is correct. Option C adds 9 instead of cancelling it. Option D changes a quadratic expression into an unrelated linear expression, so it cannot be right. Exam cue: whenever two brackets have the same first terms and opposite signs, check difference of squares first.

Related tags

Difference Of SquaresSimplificationAlgebra

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