[ 125x3 + 8y3 ] is not a question or an equation, and it doesn't require an answer
or a solution. It's simply an expression that represents a number. The value of the
number depends on the values of 'x' and 'y', which of course you haven't included,
and it changes in a flash any time either of them changes.
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17
1 cubed = 13 = 1x1x1 = 1 2 cubed = 23 = 2x2x2 = 8 3 cubed = 33 = 3x3x3 = 27 4 cubed = 43 = 4x4x4 = 64 5 cubed = 53 = 5x5x5 = 125
15 cubed = 3,375
squared is 49. Cubed is 343.
2 squared --> 4 2 cubed --> 8 3 squared --> 9 3 cubed --> 27