Answer:
a = 0 and b = literally any number
Step-by-step explanation:
because anything to the power of 0 = 1,
so e.g. 2^0 = 1 or 8^0 = 1
this is just a rule in powers that you just have to know
and for part b anything × 0 = 0, so it can be anything
hope this helps :)