(a - b) (a + 3b)
2007-01-25 05:58:48 · 6 answers · asked by boboby c 1 in Science & Mathematics ➔ Mathematics
(a - b) (a + 3b)
use distributive property.
a(a+3b)+(-b)(a+3b)
a^2+3ab-ab-3b^2
add like terms
a^2+2ab-3b^2
2007-01-25 06:05:18 · answer #1 · answered by 7 · 0⤊ 0⤋
(a - b) (a + 3b) use FOIL
a^2+3ab-ab-3b^2
a^2+2ab-3b^2
2007-01-25 14:32:07 · answer #2 · answered by yupchagee 7 · 0⤊ 0⤋
(a - b) (a + 3b) =
(a * a) + (a * 3b) + ((-b) * a) + ((-b) * 3b) =
a^2 + 3ab - ab - 3b^2 =
a^2 + 2ab - 3b^2
2007-01-25 14:31:47 · answer #3 · answered by jcastro 6 · 0⤊ 0⤋
(a - b)(a + 3b)
= a*a + a*3b + (-b*a) + (-b* 3b)
= a^2 + 3ab - ab - 3b^2
= a^2 + 2ab - 3b^2
2007-01-25 14:06:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Stop posting your homework questions and try to do them yourself. The several answers to your now 5 questions should be more than enough to help you out.
2007-01-25 14:48:17 · answer #5 · answered by lil e 2 · 0⤊ 0⤋
(a^2)+(2ab)-(3b^2)
2007-01-25 14:05:38 · answer #6 · answered by Maria B 3 · 0⤊ 0⤋