(x+3)(x-4)
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(x + 3)(x + 4)
x2 = -11x - 10 x2 + 11x + 10 = 0 (x + 1)(x + 10) = 0
(x-8)(x+8) = x2-64
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}
x2-5x = 0 x(x-5) = 0 x = 0 or x = 5