Mathematics 9709 · AS & A Level · Quadratics

Quadratics — practice question

(i)[2]

Express $4x^2 - 12x$ in the shape $(2x + a)^2 + b$.

(ii)[2]

Hence, or by another method, find the values of $x$ that satisfy $4x^2 - 12x > 7$.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct form $(2x-3)^2-9$ (values $-3,-9$ shown)” …

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