b1= [1; 1; 1; 1], b2 = [1; 1; -1; -1], b3 = [1; -1; 0; 0], b4 = [0; 0; 1; -1]

Let Beta = {b1, b2, b3, b4). Beta is basis for R^4.

What n x n matrix F has the property that x = F[x]_Beta?

What n x n matrix E has the property that [x]_Beta = Ex?

I don't need any direct calculations. I only need an explanation on how to approach this question. They don't give you the x vector, so how am I supposed to figure out the matrix? Could somebody please outline the steps or procedure needed to solve this question. I've been wrapping my head around how to figure this out. It looks pretty obvious too.