Question

Pls help I can't figure out how to factor this polynomial​

Answer 1

If you replace y = 2x + 1, it's much clearer what the common factor among the terms in the sum are.

3xy + 10y = (3x + 10) y

so the factorization would be

3x (2x + 1) + 10 (2x + 1) = (3x + 10) (2x + 1)