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= x(x-3) + 2(x-3)
= (x + 2)(x - 3)
2. x^2 + 11x -30 =x^2 + 5x + 6x - 30
= x(x + 5) gak bisa diitung '-'
3. x^2 - 7x + 10 = x^2 - 2x - 5x + 10
= x(x- 2) - 5(x - 2)
= (x- 5)(x - 2)