Question

Working with polynomials.
Simplify:
(3a − 4b)(a + b)


3a2− ab − 4b2
3a2 − 7ab − 4b2
3a2 − 12ab − 4b2
3a2 + ab − 4b2

I think it's the first one?

Answer 1

u need to do foil method
and when you multiply variables you should add their exponent