Question

@kelliegirl33 Can you explain this problem to me please? (4a + 2b)(a – b)

Answer 1

(4a + 2b)(a - b)
solve it the same way as the others, using the FOIL method.
4a^2 + 4ab + 2ab - 2b^2
4a^2 + 6ab - 2b^2

Answer 2

When I use the foil method, I get confused on the negative signs. Am I supposed to subtract or multiply?

Answer 3

wait..I think I messed up..
(4a + 2b)(a - b)
multiply first numbers in each set....4a * a = 4a^2
multiply outside numbers in each set...4a * -b = -4ba
multiply inside numbers in each set...2b * a = 2ba
multiply outside numbers i each set...2b * -b = -2b^2
combine them
4a^2 - 4ba + 2ba - 2b^2 -- combine like terms
4a^2 - 2ba - 2b^2

Answer 4

Oh, thank you @kelliegirl33.

Answer 5

I understand how it can get confusing....I even mess up on them sometimes..lol

Answer 6

Yeah, I study everymorning from 9-12

Answer 7

thats good. If you keep practicing, you will be the one helping others with their homework

Answer 8

ty :)

Answer 9

anytime :)

Answer 10

@♥Cappuccino♥
When I use the foil method, I get confused on the negative signs. Am I supposed to subtract or multiply? Definitely multiply. You may be multiplying a negative quantity by a positive one: (-2)(3)=-6, and so on.

Answer 11

Okay, thank you @mathmale