Z zhyia Junior Member Joined May 30, 2006 Messages 53 Jun 11, 2006 #1 (9c - 4d) (9c + 4d) = 81c^2 + 16d^2 (7a - 2b)(2a + 4b) = 14a^2 + 32ab - 4ab - 8b^2 = 14a^2 + 28ab - 8b^2
(9c - 4d) (9c + 4d) = 81c^2 + 16d^2 (7a - 2b)(2a + 4b) = 14a^2 + 32ab - 4ab - 8b^2 = 14a^2 + 28ab - 8b^2
S steve_b Junior Member Joined May 2, 2004 Messages 78 Jun 11, 2006 #2 (9c-4d) (9c+4d) =81c^2+16d^2 --------- Make that : 81c^2 - 16d^2 ============= (7a-2b)(2a+4b) 14a^2+32ab-4ab-8b^2 =14a^2+28ab-8b^2 -------- Almost... 14a^2 + 28ab - 4ab - 8b^2 14a^2 + 24ab - 8b^2 Steve
(9c-4d) (9c+4d) =81c^2+16d^2 --------- Make that : 81c^2 - 16d^2 ============= (7a-2b)(2a+4b) 14a^2+32ab-4ab-8b^2 =14a^2+28ab-8b^2 -------- Almost... 14a^2 + 28ab - 4ab - 8b^2 14a^2 + 24ab - 8b^2 Steve
