If the original is 2x + 3x2 + 6 + 5x3, you should rearrange the terms in order of exponent:
5x3 + 3x2 + 2x + 6
4x4x4
9,700
800
561
6 x 6 x 6 = 216
12,500
4x4x4
64 * * * * * 43
93 is 729
1,045
103 = 1,000
The answer in standard form is 86.3
67.5
6,479
It is six.
4,500
122 = 144