〖16〗^x +8^x – 4∙ 4^x + 2^x +1 =0

Question

〖16〗^x +8^x – 4∙ 4^x + 2^x +1 =0

Answer 1

16=2^4
8=2^3
4=2^2
(2^x)^4+(2^x)^3-4*(2^x)^2+2^x+1=0
2^x=1
x=0