911wgarcia
04.02.2020 •
Mathematics
Hello there!
can i get some with this calculus homework #22 a and b ? i'll do the others. you!
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Ответ:
firstly chain rule is dy/dx = dy/du * du/dx
a) y = 5u² + u - 1 hence dy/du = 10u +1
u = 3x +1 hence du/dx = 3
so dy/dx = 3(10u +1) {sub in u and expand}
b) y= u^-2 hence dy/du = -2u^-3
u=2x+3 hence du/dx = 2
so dy/dx= 2(-2u^-3) {sub in u}
Ответ:
you just subtract 78-48 to get 30