Factor `8x^3(5x-4)^(3/2)-4x(5x-4)^((-1)/2)` :

Factor out `4x(5x-4)^((-1)/2)`

---------------------------------

`4x(5x-4)^((-1)/2)[2x^2(5x-4)^2-1]`

---------------------------------

You could expand, but it is usually not a good idea:

`4x(5x-4)^((-1)/2)[50x^4-80x^3+32x^2-1]`

Or recognize the difference of two squares:

`4x(5x-4)^((-1)/2)[(2x(5x-4)+1)(2x(5x-4)-1)]`

`4x(5x-4)^((-1)/2)[(10x^2-8x+1)(10x^2-8x-1)]`

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**Thus fully factored we get:**

`4x(5x-4)^((-1)/2)[(10x^2-8x+1)(10x^2-8x-1)]`

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Factor `8x^3(5x-4)^(3/2)-4x(5x-4)^((-1)/2)` :

Factor out `4x(5x-4)^((-1)/2)`

---------------------------------

`4x(5x-4)^((-1)/2)[2x^2(5x-4)^2-1]`

---------------------------------

You could expand, but it is usually not a good idea:

`4x(5x-4)^((-1)/2)[50x^4-80x^3+32x^2-1]`

Or recognize the difference of two squares:

`4x(5x-4)^((-1)/2)[(2x(5x-4)+1)(2x(5x-4)-1)]`

`4x(5x-4)^((-1)/2)[(10x^2-8x+1)(10x^2-8x-1)]`

-----------------------------------------------

**Thus fully factored we get:**

`4x(5x-4)^((-1)/2)[(10x^2-8x+1)(10x^2-8x-1)]`