Which expression is equivalent to 5 x 5 - 6 x 4 + 8 x 3 ?
x 4 5 x - 6
x 3 5 x 2 - 6 x + 8
8 x 3 5 x 2 - 6 x + 1
6 x 5 - 6 x 4 + 8 x 3 + 1
