Question

I need help can you explain how to do it​

Answer 1

-7.

Explanation:

(x²+t²x+t³+8)`=(x²)`+(t²x)`+(t³)`+(8)`=2x*x'+2t*x+t²*x'+3t²;

`x'=(2tx+3t^2)/(t^2+2x);`

`x'(-2;-4)=(2*2*4+3*4)/(4-8)=-7.`