tu doit utilisé la distributivité :
5(2x-8) = 5*2x-5*8 = 2x - 40
-7(8+3y) = -7*8 + -7*3y = -56 + -21y
6(-z+3) = 6*(-z) + 6*3 = -6z + 18
6(1-2a)= 6*1 - 6*2a = 6 - 12a
-b(3b-7)= -b*3b - (-b)*7 = -3b² + 7b
5c(4c-6)= 5c*4c - 5c*6 = 20c² - 30c
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5(2x-8)= 10x - 40-7(8+3y)=- 56 - 21y = - 21y - 56
6(-z+3)= = - 6z + 18
6(1-2a)= 6 - 12a = - 12a + 6
-b(3b-7)= - 3b² + 7b
5c(4c-6)=20c² - 30c
tu doit utilisé la distributivité :
5(2x-8) = 5*2x-5*8 = 2x - 40
-7(8+3y) = -7*8 + -7*3y = -56 + -21y
6(-z+3) = 6*(-z) + 6*3 = -6z + 18
6(1-2a)= 6*1 - 6*2a = 6 - 12a
-b(3b-7)= -b*3b - (-b)*7 = -3b² + 7b
5c(4c-6)= 5c*4c - 5c*6 = 20c² - 30c