I an taking a pre test and I can't figure this question out at all---
56x^7+21x^4+63^3
It seems there might be a mistake in the equation you provided. The term "63^3" doesn't seem to be correctly written. It resembles a number raised to the power of 3, but it should be written as "63x^3" if it is a variable.
Please double-check the equation and clarify the correct term for assistance in solving it.