Hello, Im new to factoring polynomials:

6st + 15t -10s -25

(6st + 15t) + (-10s -25) <-- Grouped polynomials

Common factors of both groups:

(6st + 15t) --> 3t

(-10s -25) --> -5

Now factor out the common factor from each group:

= 3t(2s + 5) -5(2s + 5)

The common factor is the binomials but what are the steps to factoring this out? I lost here.

tyvm