Look at picture below or above please! I've been trying to work it out for a bit and I'm still stuck on it.
Note that we can write this as
C = 2n^(1/4) [ 20n^(1/8) + 8n^(1/3) ]
C = 2 * 20* n^(1/4 + 1/8) + 2* 8 * n^(1/4 + 1/3)
C = 40 n^(3/8) + 16 n^(7/12)
C = 40 8√ (n3) + 16 12√ (n7)
a = 3
b = 7
