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Derivative : solution of exercise 4.8 - Basic math level

How to find the derivative f' of f(x) = 5(x + 2) ? The derivative of any differentiable function of x raised to the power x or to the power g(x) can be found taking successively the natural logarithm and derivative of both the left and right sides. You can use as well the derivative formula for
( f(x)g(x) )'

Derivative exercises for basic math level