Question

Calculati: 2 la puterea a + 2 la puterea a+1

Answer 1

2^a+2^(a+1)=
2^a+2^ax2=
2^a(1+2)=2^ax3=3x2^a

Answer 2

2 la puterea a+ 2 la puterea a+1
⇒2 la puterea a²+a  +2 la puterea a²+a
⇒[2 la puterea a²+a]·2
⇒2 la putera a²+a+1;