lucyabaird lucyabaird

26-12-2017
Mathematics

contestada

If y = 3x3 – 2x and dx, dt equals 3, find dy, dt when x = –2. Give only the numerical answer. For example, if dy, dt = 4, type only 4.

Respuesta :

pineapple205 pineapple205

11-10-2018

y=3x^3-2x, dx/dy =3

dy/dt= ? (when x=-2)

dy/dt= d/dt (3x^3 -2x)

= 9x^2(dx/dt) -2(dx/dt)

= 9(-2)^2 * 3 - (2*3)

= 9(4)*3 -6

= 102

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