The vertex is (-2,-1) the y intercept is (0,-9) whats the function?

The vertex form:

We have the vertex (-2, -1) → h = -2 and k = -1. Substitute:

We have the y-intercept (0, -9). Substitute f(x) = -9 and x = 0:

     add 1 to both sides

      divide both sides by 4

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

17.08

correct me if i am wrong.