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Sagot :

Réponse:

Bonjour.

1)

(3x+2)(5x+4)= 3x×(5x+4)+2×(5x+4)

= 3x×5x+3x×4+2×5x+2×4

=15x au carré + 12x+10x+8

=15x au carré +22x+8

2)

(5x+3)(2x+8)= 5x×(2x+8)+3×(2x+8)

= 5x×2x+5x×8+3×2x+3×8

=10x au carré +40x+6x+24

=10x au carré +46x+24

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