Question 34

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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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