Does anyone know how to figure this out please and thank you. I’ve tried how I thought would work and it doesn’t

Simply 8x squared + 5(7x squared- x) - 2x =

Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.

Answer asap! urgent! will give brainliest!