Question 33

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Jambmaths question: 

If $y={{x}^{2}}-3x+4$ find $\tfrac{dy}{dx}$ at x = 5

Option A: 

3

Option B: 

5

Option C: 

7

Option D: 

9

Jamb Maths Solution: 

$\begin{align}  & y={{x}^{2}}-3x+4 \\ & \frac{dy}{dx}=2x-3 \\ & \text{At }x=5 \\ & {{\left. \frac{dy}{dx} \right|}_{x=5}}=2(5)-3=7 \\\end{align}$

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