ex3 ajutorrrrrrrrrrr

Ex3 Ajutorrrrrrrrrrr class=

Răspuns :

a)   5a(2x-1)-(2x+1)(a-3)=10ax-5a-(2ax-6x+a-3)=10ax-5a-2ax+6x+a-3=8ax-6a+6x+3

b)  (x+1)2 +(3x+1)(3x-1)=x2+2x+1+9x2-3x+3x-1=10x2+2x