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Step-by-step explanation:
19) x^2 - 10x - 119
=> x^2 + 7x - 17x - 119
=> x(x + 7) - 17(x +7)
=> (x - 17) (x + 7)
21) x^2 - 25x + 66
=> x^2 - 3x - 22x + 66
=> x(x - 3) - 22(x - 3)
=> (x - 22) ( x - 3)
22) x^2 + 27x + 140
=> x^2 + 20x + 7x + 140
=> x(x + 20) + 7(x + 20)
=> (x + 7) (x + 20)
23) x^2 - 6x - 72
=> x^2 - 12x + 6x -72
=> x(x - 12) + 6(x - 12)
=> (x + 6) (x - 12)
24) x^2 - 7x - 30
=> x^2 + 3x - 10x - 30
=> x(x + 3) - 10(x + 3)
=> (x - 10) (x + 3)
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