Simplify these ..working with polynomials
(3x^2-2x++5x-5)

and

(4x-3+2x^2)+(2x+1)

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Equation for the calculation double 2 and then add 5