Bonjour ;
Exercice n° 2 .
A = - 3(4y - 7)
= (- 3) * (4y) + (- 3) * (- 7)
= - 12y + 21 .
B = 2x(3 - 5x) - 8x + 6
= (2x) * 3 + (2x) * (- 5x) - 8x + 6
= 6x - 10x² - 8x + 6
= - 10x² - 2x + 6 .
Exercice n° 3 .
C = 3x + 15
= 3x + 3 * 5
=3(x + 5) .
D = 4y² + 14y
= (2y) * (2y) + 7 * (2y)
= (2y)(2y + 7)
= 2y(2y + 7) .
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Bonjour ;
Exercice n° 2 .
A = - 3(4y - 7)
= (- 3) * (4y) + (- 3) * (- 7)
= - 12y + 21 .
B = 2x(3 - 5x) - 8x + 6
= (2x) * 3 + (2x) * (- 5x) - 8x + 6
= 6x - 10x² - 8x + 6
= - 10x² - 2x + 6 .
Exercice n° 3 .
C = 3x + 15
= 3x + 3 * 5
=3(x + 5) .
D = 4y² + 14y
= (2y) * (2y) + 7 * (2y)
= (2y)(2y + 7)
= 2y(2y + 7) .