a) x²-4x-45=x²+5x-9x-45=(x+5)(x-9)
b) x²+x-42=x²+7x-6x-42=(x+7)(x-6)
c) x²+13x+40=x²+8x+5x+40=(x+8)(x+5)
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a) x²-4x-45=x²+5x-9x-45=(x+5)(x-9)
b) x²+x-42=x²+7x-6x-42=(x+7)(x-6)
c) x²+13x+40=x²+8x+5x+40=(x+8)(x+5)