5w^2(3w^8-w^6)

5w^2(3w^8-w^6)

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OK......this isn't too hard...we just have to remember a property of exponents.....aⁿ * a^m = a ^n+m

Notice what we have is really   5w²*3w⁸ - 5w²w⁶   = 5*3*w²*w⁸ - 5*w^2*w⁶ 

So this is just

15w¹⁰ - 5w⁸

And that's it !!