How do I solve this?

Question

The difference of the squares of two positive consecutive even integers is 84. Find the integers. Use the fact​ that, if x represents an even​ integer, then x+2 represents the next consecutive even integer.

Answer 1

(x+2)^2 - x^2 = 84

x^2 + 4x + 4 -x^2 = 84

4x +4 = 84

4x = 80

x =20

x +2 = 22

22^2 - 20^2 = 484 - 400 = 84