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Find the slope of tangent line to the gr...

Find the slope of tangent line to the graph of `f(x) =-5x^(2) + 7x` at `(5, f(5))`.

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The correct Answer is:
`f(x_0) = `f(x_0) = underset(Delta x to 0) (Delta y )/( Delta x ) = - 43`.lim
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