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Inclination of a Line

The gradient ...

Question

The gradient of the line joining the points on the curve $y = x^{2} + 2 x$ whose abscissa are 1 and 3, is

A

6

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B

5

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C

4

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D

3

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Solution

The correct option is A 6
The points are(1,3) and (3, 15).
Hence gradient $= \frac{12}{2} = 6$ .

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