Help me it’s 14 I’ll give brainliest it by today SO HELP 15 points

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Need plz been trying to do it for a long time and still haven’t succeeded