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[tex]Bonjour, \\\\\\( 3 - 2 x ) ( 5 x + 6 ) \\= 15 x + 18 - 10 x^{2} - 12 x \\= - 10 x^{2} + 3 x + 18 \\\\\\( 7 x - 5 ) ( - x - 3 ) \\= - 7 x^{2} - 21 x + 5 x + 15\\= - 7 x^{2} - 16 x + 15[/tex]

MITCHALEXANDRINE2314

1)(3-2X)(5X+6)

=(3×5X)+(3×6)-(2X×5X)-(2X×6)

=15X+18-10X2-12X

=3X+18-10X2

2)(7X-5)(-X-3)

=-(7X×X)-(7X×3)+(5×X)+(5×3)

=-7X2-21X+5X+15

=-7X2-16X+15

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