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d(x

First step: We can distribute the derivative to both the terms:

This gives; d (5x

Using the above formula, we get: (5 *3 * x

= (15 * x

Hence the derivative of f(x) is f’(x) = 15 x

Power rule states anti-derivative of x

The anti-derivative of x is 1/2 x

Using the power rule the anti-derivative of 20 needs to be found.

20 can be written as 20x

Therefore, the anti-derivative of 20 x

Hence anti derivative F(x) = 20 x -1/2 x