Anyone know?

Ithink i know it but i want to be sure so can you me out ?

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

Which shows one way to determine the facts of x3+4x2+5x+20 by grouping