tolong di jawab ya kak

[tex] {2}^{2x} - {2}^{x} . {2}^{3} + 16 = 0 \\ misal \: {2}^{x} = a \: \\ {a}^{2} - 8a + 16 = 0 \\ (a - 4)(a - 4) = 0 \\ a = 4 \\ {2}^{x} = 4 \\ x = 2[/tex]
JAWABAN : B