Question #11100208

# Help on exponent problems please.?

**These problems are tricky. I keep on getting the wrong answer.
Simplify and write with positive exponents.
A.) 16x^4 - 8x^2 + 12x over 4x^2 (fraction)
B.) [(xy^-4 over Z)^5]^3
Thanks in Advance
**

TELL US , if you have any answer