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Factorise (x^2-6x+9-z^2).

Answer and explanation

Correct answer: ((x-3-z)(x-3+z))

Direct answer: option A, \((x-3-z)(x-3+z)\). First group the first three terms: \(x^2-6x+9=(x-3)^2\). The expression becomes \((x-3)^2-z^2\). Use the difference-of-squares identity \(a^2-b^2=(a-b)(a+b)\), with \(a=x-3\) and \(b=z\). This gives \((x-3-z)(x-3+z)\). Option A is exactly this factorisation. Option B uses \(x+3\), whose square would give \(+6x\), not \(-6x\). Option C is only an intermediate form, not fully factorised. Option D squares the whole difference incorrectly and does not represent \(a^2-b^2\). Memory cue: complete the square, then use difference of squares.

Related tags

Quadratic ExpressionsPerfect SquareDifference Of Squares

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