II Développer et reduire H=3(4a-3) I=(y+2)(y+5) J=(4c-3)(2c+1) K=(x-4)(2x-3)

H= 3(4a - 3)
H= 12a - 9

I= (y + 2)(y + 5)
I= y² + 5y + 2y + 10
I= y² + 7y + 10

J= (4c - 3)(2c + 1)
J= 8c² + 4c - 6c - 3
J= 8c² - 2c - 3

K= (x - 4)(2x - 3)
K= 2x² - 3x - 8x + 12
K= 2x² - 11x + 12

H=3(4a-3)
= 12a-9

 I=(y+2)(y+5)
= y^2+5y+2y+10
= y^2+ 7y + 10

J=(4c-3)(2c+1)
= 8c^2+4c-6c-3
= 8c^2 -2c -3

K=(x-4)(2x-3)
= 2x^2-3x-8x+12
= 2x^2 -11x + 12