Question

d/dx[sqrt(20-x^2-7y^2)]

Answer 1

1\[-2x^2-14ydy/dx/2\sqrt{?}\]

Answer 2

sorry i wrote wrong

Answer 3

\[ \frac{d}{dx} \sqrt{20-x^2-7y^2} \\
\frac{d}{dx} \left( 20-x^2-7y^2\right)^{\frac{1}{2} }
\]

Answer 4

start by using the power rule
\[ \frac{d}{dx} u^n= n \ u^{n-1} \frac{d}{dx} u \]