Question

Cerinta : Daca x=3 si a+b=9 , calculati :

2a + 2b + 2x =
10x - (2a + 2b) =
x + 8a + 8b =
xa + xb =
(3a + 3b - 2x) · (2a + 2b - 3x) =

Va rog , dau 20 de punte (poti verifica ;) )
URGENT !!

Answer 1

2a+2b+2x=(2*9)+(2*9)+(2*3)=18+18+6=42 ;10x-(2a+2b)=(10*3)-(2*9)+2*9)=30-18+18=12+18=30 ;x+8*9+8*9=3+72+72=147 ; xa+ xb=(3*9)+ (3*9)=27+27=54 ; (3*9+3*9-2*3)*(2*9+2*9-3*3)=(27+27-6)*(18+18-9)=(54-6)*(36-9)=48*27=1296