Question

Scoateti factor comun:
a) 2(x-1)+5(x-1)=….
b) (x+5)(a-2)+(x+5)(a-1)=....
c) (2x-7)(3y+4)+(2x-7)(2y-2)=….
d) (x+3y)(2a-b)-(x+3y)(a+3b)=....

Answer 1

la a)
(x-1)(2+5)= 7(x-1) 
la b)
(x+5)[(a-2)+(a-1)]= (x+5)(2a-3)
la c)
(2x-7)[(3y+4)+(2y-2)]= (2x-7)(5y+2)
la d) 
(x+3y)[(2a-b)-(a+3b)]= (x+3y)(a-4b)