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  4. The function f(x) = x2 - 2x is increasing in the interval

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Q. The function $f(x) = x^2 - 2x$ is increasing in the interval

Application of Derivatives

Solution:

$f'(x) = 2x - 2 = 2(x - 1) \ge 0$
if $f(x)$ is increasing
$\Rightarrow x \ge 1$.