Question

1.A Local min of y=x^3+2x^2-1 is?

2.The Y-intercept of x^3+2x^2-1 is?

3.The Y-intercept of x^2+4x-2 is?
Pleaseeee help

Answer 1

\[ y=x^3+2x^2-1\]take the derivative, set it equal to zero and solve

Answer 2

you can do an observation of local minimums by comparing the first and second derivative tests.

or if you area allowed, graphing would be easier....

Answer 3

Test the intervals that are defined by your critical points. Increasing/Decreasing, to find local maximum and minimum values.

Answer 4

The y-intercept is when x=0, so use the point (0,y)