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Sagot :

Bonsoir,

I = (x + 5)(10 + 7x)

=10x +7x²+50+35x

= 7x²  +45x +50

J = (4x + 2)(x - 12)

= 4x² -48x +2x -24

=4x² -46x -24

K = (5-9x)(2x + 8)

=  10x +40 -18x² -72x

= -18x² -62x +40

L = (9 - 3y)(6 - 5y)

= 54 -45y -18y +15y²

=15y² - 63y +54

Merci beaucoup !

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