Difference of two squares easy problem

This is 8th grade math.

so here's the problem: 81h to the fourth power, minus 49q to the fourth. I just ned help factoring it.
Ill put powers in parenthesese if you dont understand. 81h(4)- 49q(4)

1. Is it factorable?
2. If so, factor it. If not, explain why.

PLEASE help. its the only math problem im stuck on for my homework and not too many websites have been too helpful.

(9h² + 7q²)(9h² – 7q²)

(√ first - √ second) ( √ first + √ second)

(9h² - 7 q²)(9h² + 7 q²)

a^2 - b^2 =(a+b)(a-b)
81h(4)- 49q(4) = (9h^2)^2 - (7q^2)^2 =(9h^2+7q^2)(9h^2-7q^2)