Question

4^x-1 -5.2^x +16 =???
Tolong bantu caranya yaaaaaa :)

Answer 1

4^x-1 - 5.2^x + 16 
= 4^x.4^-1.  - 5.2^x + 16 
= 2^2x . 4^-1 - 5.2^x + 16 
= 2^x ( 2^2 . 4^-1 - 5) +16
= 2^x ( 4.1/4 - 5) +16
= 2^x ( -4) + 16
= 2^x (-4) = -16
= 2^x = -16/-4
=2^x = 4
= x = 2