Posted by A Girl. on .
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,
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.,
I don't understand how you got that for #1.

I really need help! (Math) 
Damon,
1. Notation confusion maybe
(8^3 x^3) / 8^4
= (1/8) x^3