Question 180106
please Simplify each expression.. 
1. (16x^8)^-0.75 

= (2^4x^8)^(-3/4)

Taking the 4th root you get:

= (2x^2)^-3

Cubing you get:

= (8x^6)^(-1)

Invert to get:

= 1/(8x^6)
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2. (-64a^9)^4/3

= (-4^3a^9)^(4/3)

Take the cube root to get:

= (-4a^3)^4

Raise to the 4th power to get:

= (256a^12)

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Cheers,
Stan H.