# Thread: Bah! I am lost with exponents!

1. ## Bah! I am lost with exponents!

$\displaystyle \sqrt[4]{16a^7b^8}$$\displaystyle =$$\displaystyle 2ab^2 \sqrt[4]{a^3}$

I don't know how to make the jump from the first thing to the last thing.

EDIT: There was a typo, sorry.

2. $\displaystyle \sqrt[4]{16a^7b^8}$

$\displaystyle =\sqrt[4]{16a^3a^4b^8}$

$\displaystyle =\sqrt[4]{16}\sqrt[4]{a^3}\sqrt[4]{a^4}\sqrt[4]{b^8}$

$\displaystyle =2ab^2\sqrt[4]{a^3}$

Does this help?

3. Originally Posted by Kasper
$\displaystyle \sqrt[4]{16a^7b^8}$

$\displaystyle =\sqrt[4]{16a^3a^4b^8}$

$\displaystyle =\sqrt[4]{16}\sqrt[4]{a^3}\sqrt[4]{a^4}\sqrt[4]{b^8}$

$\displaystyle =2ab^2\sqrt[4]{a^3}$

Does this help?
I dont mean to intrude, but would someone mind expanding on this solution? Im not sure I quite understand the fine details of what is going on here.

Thanks

4. Originally Posted by allyourbass2212
I dont mean to intrude, but would someone mind expanding on this solution? Im not sure I quite understand the fine details of what is going on here.

Thanks
For sure!

Well because $\displaystyle a^3a^4=a^7$ Just a small expansion.

$\displaystyle \sqrt[4]{16a^3a^4b^8}$

By the rule $\displaystyle \sqrt{ab}=\sqrt{a}\sqrt{b}$, so we can split up the expression and take the fourth root of each term.

For additional clarification, I will rewrite that.

$\displaystyle \sqrt[4]{16}\sqrt[4]{a^3}\sqrt[4]{a^4}\sqrt[4]{b^8} $$\displaystyle =\sqrt[4]{2^4}\sqrt[4]{a^3}\sqrt[4]{a^4}\sqrt[4]{b^8}$$\displaystyle =2ab^2\sqrt[4]{a^3}$

Does this help, or should I clarify more?