Find a, b, c, d so f(x) = ax^3 + bx^2 + cx + d has....

[dme]

Hi Again!

Here is a similar problem.

Find the value of a, b, c, and d such that f(x) = ax^3 + bx^2 + cx +d has a local minimum at (2, -8), a local maximum at (-1, 19), and a y-intercept at y = 12.

How do I find these letter values?

Thanks again!

 

[stapel]

Since the exercise refers to max and min points, a good first step might be to find the first derivative, plug in each x-value, and set the result equal to zero. What does this give you?

Eliz.