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2. x^2 - 2x -15
(x-4)(x-6)
x.x+x.(-6)-4.x+(-4)(-6)
x^2-6x-4x+24
x^2-10x+24
2. (x-x1)(x-x2)
(x-(-5))(x-3)
(x+5)(x-3)
x.x+x.(-3)+5.x+5.(-3)
x^2-3x+5x-15
x^2+2x-15