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Sagot :

I= (x+4)(x-5)
= x^2-5x+4x-20
=X^2-x-20

J=(x+8)(x-3)
= x^2-3x+8x-24
=x^2+5x-24

K=(3x+4)(x-7)
= 3x^2+21x+4x-28
= 3x^2+25x-28

L=(8x-2)(2x+3)
= 16x^2+24x-4x-6
= 16x^2+20x-6

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