Question

help plz!

Answer 1

http://prntscr.com/8fzbpc

Answer 2

i need a step by step explanation

Answer 3

You would factorize the area and see if x is one of the factors.
For example, if the area is 35 and width is 5, then
1. factorize 35=7*5
2. Since the width is 5, so the length must be 7 so that 5*7=35=area.
The idea is the same in algebra. All the unknowns are just numbers in disguise.
In case you need to learn how to factor, try:
http://www.purplemath.com/modules/factquad.htm