Answer
$f'(x)=2x^{-\frac{1}{2}}+9.9x^2$
Work Step by Step
First you have to re-write this number before you can take its derivative. You re-write it as $4x^{\frac{1}{2}}+3.3x^3$ Then you take the derivative of that number by applying the derivative rule. A number with an x variable, you take the exponent, multiply it with the number in front, then subtract one from the exponent.