Answer:
-1.54, 0.87.
Step-by-step explanation:
Find the derivative ;
y = x^3 + x^2 - 4x + 2
y' = 3x^2 + 2x - 4
This equates to zero when the function is at a minimum/ maximum,
Solving 3x^2 + 2x - 3 gives x = -1.54, 0.87.
The second derivative is 6x + 2 which gives a negative for x = -1.54 ( Maximum) and positive x = 0.87 (minium).
