As written, that's 12a + 18 which factors to 6(2a + 3)
a^2 + 11a + 18 = (a + 9)(a + 2)
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11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
9a + 3b - 11a - 4b = -2a -b
It can be simplified to: 11a-11
11a-3a =8a so 8a+9=-7 8a = -16 a=-2
3