Question

y=x^3+2x^2的拐点坐标是__________________

Answer 1

y=x^3+2x^2

y'=3x^2+4x

=x(3x+4)

x=0 x=-4/3

x=0 y=0

x=-4/3 y=-32/27

拐点坐标是_(0.0) (-4/3,-32/27)