# Math Help - derivate

1. ## derivate

If , find .

f(x) = 4x + 2x^-1

f ' (x) = 4 - 2x^-2 = 4 - 2/x^2

can anybody tell me what im doing wrong?

2. $y=4x+\frac{2}{x}$

then

$y' = 4+2\cdot \left(\frac{1}{x} \right)'$

Now using the quotient rule

$y'=4-2 \cdot \left(\frac{1}{x^2} \right)$

can now conclude

3. thank you my good sir