Question

I'm can't seem to find a common base. I know the answer's x=4 but I thought it was x=0.

Answer 1

64^x = 256 * 16^x

2^6x = 2^8 * 2^4x

2^6x = 2^(4x+8)

6x = 4x +8

2x = 8

x = 4