Question

16a^2-25b^2 show work

Answer 1

I assume you want it factored.
Remember, a^2-b^2 = (a+b)(a-b)
16a^2-25b^2 = (4a - 5b)(4a+5b)
(4a - 5b)(4a+5b)

Answer 2

this difference of two squares
= (4a+5b)(4a-5b)