(x + 9)(x + 2)
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-(x + 5)(x + 6)
x2 -11x-12= (x-12)(x+1)
x2 + 11x + 18 (x + 9)(x + 2) CHECK: x2 + 9x + 2x + 18 x2 + 11x + 18 SET EACH EQUAL TO ZERO: x + 9 = 0 x = -9 x + 2 = 0 x = -2 NOW YOU ARE DONE: Solution set: {-9, -2}
The LCM is the absolute value of x.
x2 = -11x - 10 x2 + 11x + 10 = 0 (x + 1)(x + 10) = 0