9x^2-6xy+y^2 = (y-3x)^2
(y-3x)^2-81 -> ((y-3x)+9)((y-3x)-9)
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9x2 + 9x - 10 =(3x - 2)(3x + 5)
Factor: 9x2 - 25.
9x2 + 12x + 4 = 9x2 + 6x + 6x + 4 = 3x(3x + 2) + 2(3x + 2) = (3x + 2)(3x + 2) = (3x + 2)2
9x2 + 6x + 1 = 9x2 + 3x + 3x + 1 = 3x(3x + 1) + 1(3x + 1) = (3x + 1)(3x + 1) or (3x +1)2
9x2