Pls help probability

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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.

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?