Question

For which value(s) of x does f(x)=8x3/3 +5x2 −10x+15 have a tangent line of slope −7? If there is more than one answer, give all of the x-values separated by commas, e.g. if f(x) has a tangent line of slope −7 at x=3 and x=5 enter 3,5.

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Tagged in
Math
Calculus

Derivative