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  4. Derivative of the function f (x) = (x - 1) (x - 2) is

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Q. Derivative of the function $f (x) = (x - 1) (x - 2)$ is

Limits and Derivatives

Solution:

Applying product rule,
$f'(x) = (x -1) \frac{d}{dx} (x -2) +(x -2) \frac{d}{dx} (x- 1)$
$ = x - 1 + x - 2 = 2x - 3$