Posted by **A Girl.** on Thursday, February 2, 2012 at 10:17pm.

Simplify the expression. Write your answer using only positive exponents.

Explain as well.

1. (8x)^3*8^-4

2. 2x^-5*y^-3

3. (4x^4y^-3)^-2

4. 1/(3x)^-2

- I really need help! (Math) -
**Reiny**, Thursday, February 2, 2012 at 10:36pm
1.

8^3 x^3/8^4

= x^3/8

2. 2/x^5 * 1/y^3

= 2/(x^5 y^3)

3. 1/(4x^4 y^-3)^2

= 1/(16x^8 y^-6)

= y^6 /(16x^8)

4. 1/(3x)^-2

= (3x)^2

= 9x^2

- I really need help! (Math) -
**A Girl.**, Thursday, February 2, 2012 at 10:39pm
I don't understand how you got that for #1.

- I really need help! (Math) -
**Damon**, Friday, February 3, 2012 at 6:34am
1. Notation confusion maybe

(8^3 x^3) / 8^4

= (1/8) x^3

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