Easy
Find the derivative of the function: $4 \sqrt{x} - 2$. (Assume $a, b, c, d, p, q, r, s$ are fixed non-zero constants and $m, n$ are integers.)
(N/A) Let $f(x) = 4 \sqrt{x} - 2$.
$f'(x) = \frac{d}{dx}(4 \sqrt{x} - 2)$
$= \frac{d}{dx}(4 \sqrt{x}) - \frac{d}{dx}(2)$
$= 4 \frac{d}{dx}(x^{1/2}) - 0$
$= 4 \left( \frac{1}{2} x^{1/2 - 1} \right)$
$= 2 x^{-1/2} = \frac{2}{\sqrt{x}}$.
$f'(x) = \frac{d}{dx}(4 \sqrt{x} - 2)$
$= \frac{d}{dx}(4 \sqrt{x}) - \frac{d}{dx}(2)$
$= 4 \frac{d}{dx}(x^{1/2}) - 0$
$= 4 \left( \frac{1}{2} x^{1/2 - 1} \right)$
$= 2 x^{-1/2} = \frac{2}{\sqrt{x}}$.
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