waecmaths question:
The graph of the relation $y={{x}^{2}}+2x-k$ passes through the points (2,0). Find the value of k
Option A:
0
Option B:
–2
Option C:
–4
Option D:
–6
waecmaths solution:
$\begin{align} & y={{x}^{2}}+2x-k \\ & \text{when }x=2,\text{ }y=0 \\ & 0={{2}^{2}}+2(2)+k \\ & k=-8 \\\end{align}$
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