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What is the perfect square form of (4x^2-12x+9)?

Answer and explanation

Correct answer: ((2x-3)^2)

The expression has a positive first term, a negative middle term, and a positive constant. This suggests the pattern \(a^2-2ab+b^2=(a-b)^2\). The first term \(4x^2\) is \((2x)^2\), and the last term 9 is \(3^2\). The middle term from the identity is \(-2\cdot2x\cdot3=-12x\), exactly as required.

Therefore \(4x^2-12x+9=(2x)^2-2(2x)(3)+3^2=(2x-3)^2\). Option C is correct. Option A would give a positive middle term, producing \(4x^2+12x+9\), not the given expression. Options B and D have incorrect leading coefficients or constant terms. Including the coefficient 2 in the square root of \(4x^2\) is essential.

Related tags

Quadratic ExpressionsPerfect SquareCoefficient

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