Posted by nina on Wednesday, February 9, 2011 at 8:23pm.
(3a-2b)(4a+3b)
Using FOIL-first, outer, inner, last
(3a - 2b)(4a + 3b)
First = 3a * 4a = 12a^2
Outer = 3a * 3b = 9ab
Inner = -2b * 4a = -8ab
Last = -2b * 3b = -6b^2
12a^2 + 9ab - 8ab - 6b^2
Combine like terms
12a^2 + ab - 6b^2
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