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Which is the factorised form of (4x^2+4xy+y^2-16)?

Answer and explanation

Correct answer: ((2x+y-4)(2x+y+4))

The first three terms form the square of a binomial: 4x²+4xy+y²=(2x+y)². Also, 16=4². Therefore the expression becomes (2x+y)²−4². Applying the difference-of-squares identity u²−v²=(u−v)(u+v), with u=2x+y and v=4, gives (2x+y−4)(2x+y+4). Hence option A is the required factorised form.

Expanding the factors confirms the result: [(2x+y)−4][(2x+y)+4]=(2x+y)²−16=4x²+4xy+y²−16. Option D stops at an intermediate form and is not fully factorised. Option B has the wrong sign in the xy term because it uses 2x−y, while option C does not reproduce the original expression.

Related tags

Perfect SquareDifference Of SquaresFactorisation

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