Find the answer for the question please..

What is the standard form of -5x^2+2x^4-11+x^3+3x

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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.