Need with 2nd grade math
80-20 =

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Could someone me with this question i’ve been stuck on it for 20 minutes

Scenario: 2 storage sheds are to have the same area. 1 is square and the other is rectangular. the rectangular shed is 4 meters wide and 9 meters long question: how large is one side of the square shed in meters?