Question

4(4x^-10y^9)^-7

4^number x^number y^number

Answer 1

good luck getting any answers that you like more than those already provided.

Answer 2

Oh. I see you have changed the problem. Surely by now you can see that the new version will give you
4*4^-7 x^70 y^-63
or, since (a^m)(a^n) = a^(m+n),
4^-6 x^70 y^-63