What is [35-(8+2)x3) I’m trying to help my cousin with his homework

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

What is the value of f(x) = 2.2 for f(-2)?