h(n) = -3 • 4^2n+1; Find h(2n)

Answer 1

maybe you mean
h(n) = -3 • 4^(2n+1) ?????

h(2n) = -3 * 4 ^(2{2n] +1)

= -3 * 4^(4n+1)

Answer 2

or,

-3 * 4*4^(4n)
= -12 * 4^(4n)
= -12 * 256^n