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x² +2x -5x -10
(x² +2x) -(5x +10)
x(x +2) -5(x +2)
(x -5) (x +2)
b. 3x² -x -10
3x² +5x -6x -10
(3x² +5x) -(6x +10)
x(3x +5) -2(3x +5)
(x -2) (3x +5)