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Write $gf(x)$ in the form $a(x + b)^2 + c$, where $a$, $b$ and $c$ are constants.
Mathematics 9709 · AS & A Level · Functions
Functions — practice question
The functions $f$ and $g$ are given for $x \in \mathbb{R}$ by $f : x \mapsto 2x + 3$ and $g : x \mapsto x^2 - 2x$.