Answered

Factorise ces expressions.
C= 2i (i+1) + 2i (2+i)
D= b² - 10b + 25
E= (2-x)² + (2-x)(9+x)
F= (5x + 1)² - 81
G= (7d + 2)² - (3d + 4)²

Sagot :

c=2i(i+1+2+i)
c=2i(2i+3)

d=bxb-10xb+25
d=b(b-10+25)
d=b(b+15)

e=(2-x)x(2-x)+(2-x)(9+x)
(2-x)(2-x+9+x)
(2-x)(11)