Answer; 320x^6
We have been given the expression (5x^3 (4x)^3)
first solve the whole cube power over 4x we will get 4^3=64
(4x)^3= 64x^3
The word equivalent in any expression means the simplest form of the expression form we get after simply it here simplification means multiplying the expression
Now, multiply 5x^3* 64x^3 is equal to 320x^6
Therefore, given expression is equivalent to 320x^6
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