Question

Determinati multinea A={a apartine N| 2 la puterea a +4 la puterea a =20}. VA ROG AJUTATIMA !!!!!

Answer 1

2ᵃ +4ᵃ =20
2ᵃ + (2²)ᵃ = 20
2ᵃ +2²ᵃ =20
2ᵃ ( 1+ 2ᵃ) = 20
4 x 5=20
2ᵃ=4
2²=2ᵃ
a=2
A={2}