# cube roots

• October 16th 2010, 09:41 PM
rebel15851
cube roots
Okay I desperately need help with this one:

cube root of 72*t^8 power.

Sorry, new to the forum and not sure how to write it out using math signs.
• October 16th 2010, 11:09 PM
mr fantastic
Quote:

Originally Posted by rebel15851
Okay I desperately need help with this one:

cube root of 72*t^8 power.

Sorry, new to the forum and not sure how to write it out using math signs.

Use the usual index laws to simplify $\displaystyle \left( 72 t^8\right)^{1/3}$. Note that 72 = 8x9 = 2^3 x 9.