ex 23 svp aidez moi

a) 6xX + 6x8
b) 7x5 - 7xA
c) X x 12 - X x y
d) 15 x a + 15 x b

a) 8*(6+x)
= (8*6)+(8*x)
= 48+8x

b) 7*(5-a)
= (7*5)-(7*a)
= 35-7a

c) x*(12-y)
= (x*12)-(x*y)
= 12x - xy

d) (15+b)*a
= (15*a)+(a*b)
= 15a + ab