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Choose the factorised form of (x^2+8x+16-y^2).

Answer and explanation

Correct answer: ( (x+4-y)(x+4+y) )

The first three terms form a perfect square: \(x^2+8x+16=(x+4)^2\). The original expression can therefore be rewritten as \( (x+4)^2-y^2\). This is a difference of two squares, using \(A^2-B^2=(A-B)(A+B)\), with A equal to \(x+4\) and B equal to y.

Applying the identity gives \( (x+4-y)(x+4+y)\), which is option D. Multiplying the factors produces \( (x+4)^2-y^2=x^2+8x+16-y^2\), so the result is verified. Option A contains only one of the two required factors and is incomplete. Option C changes the structure into a square, while option B does not reproduce the original expression. First forming the perfect square makes the factorisation clear.

Related tags

Difference Of SquaresCompletionQuadratic Expression

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