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Sagot :

VINS

bonsoir

a=(2a-6)(4a+5)

 = 8 a² + 10 a - 24 a - 30

 = 8 a² - 14 a - 30

b=(3a-1)(6-a)

 = 18 a - 3 a² - 6 + a

 =  - 3 a² + 19 a - 6

c=3(7a-6)-(4+a)

=  21 a - 18 - 4 - a

=  20 a - 22

d= -(4a+1)+(4a-2)(3+a)​

=  - 4 a - 1 + 12 a + 4 a² - 6 - 2 a

=  4 a²  + 4 a - 7

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