How to solve this?

Easiest way to find the slope is to take the derivative of the equation.

All quadratic equations give you a graph which is parabolic. So the slope can vary from anywhere between - \infty to + \infty

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How to do that?

f(x)=ax^2+bx+c

Then the slope is given by

f′(x)=2ax+b

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So in the current sum,

slope will be 6x+5 ? Is that correct using your formula?

yes

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