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Factor completely: 2a2 + 2a 84

2007-04-08 14:54:52 · 4 answers · asked by Greg L 3 in Science & Mathematics ➔ Mathematics

Factor completely: 2a2 + 2a minus 84

2007-04-08 14:55:25 · update #1

2a^2 + 2a - 84
= 2(a^2 + a - 42)
= 2(a + 7)(a - 6)

2007-04-08 14:58:47 · answer #1 · answered by Anonymous · 0⤊ 0⤋

a^2+a-42=0
a=((-1+-sqrt(169))/2 so a= 6 and a = -7
so
2a^2+2a-84 = 2(a-6)(a+6)

2007-04-08 22:01:56 · answer #2 · answered by santmann2002 7 · 0⤊ 0⤋

2(a^2 +a - 42)
2(a+7)(a-6)

2007-04-08 21:58:59 · answer #3 · answered by bz2hcy 3 · 0⤊ 0⤋

2(a^2+a-42)= 2(a-6)(a+7)

2007-04-08 21:59:37 · answer #4 · answered by cattbarf 7 · 0⤊ 0⤋