Question

find 13 part i.e value of x

Answer 1

2^2x - 2^x*2³= -16
now
2^2x - 8*2^x = -16
2^x = p(consider)
p²-8p+16=0
(p-4)² = 0
so p=4
i.e.
2^x = 4
so X = 2