Homework Help: I really need help! (Math)

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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