Question

im need to find the stationary points for, y=x^4 + 8x^3 + 18x^2 - 27, i know i need to change it to dy/dx, then make dy/dx = 0 but after that im stuck

Answer 1

so you're stuck finding the roots of the cubic?

Answer 2

yeah, i think.

Answer 3

\[4x^3+ 24x^2 + 36x\]
\[4 x(x^2+ 6x +9)\]
\[4 x(x+3)(x+3)\]

Answer 4

thank you, i understand what to do now