Homework Help: Simplify the expression assume all variables are positive?

1. Jan 29, 2006

chris4434

I have three math problems that I am unsure of how to do. could someone please help thanks.

$$\sqrt[3]{-8x^3y^3z^3}$$

$$({4xy^-1}/{16xy^2})$$

$$\sqrt{98}+\sqrt{2}$$

Last edited: Jan 29, 2006
2. Jan 29, 2006

d_leet

Well for the first one you have the cube roots of 3 numbers which have been cubed so what do you think you should do?

For the second I'm not entirely sure what the expression is supposed to be but the only thing I can think of is to expres it without the negative exponent.

For the third the two radicals need to be in terms of a common radical so see if you can figure out to make $$\sqrt{98}$$ into some number times the square root of 2.

3. Jan 30, 2006

HallsofIvy

What is $\sqrt[3]{-8}$?
What is $\sqrt[3]{x^3}$?

What is $\frac{4}{16}$?
You have an "x" in both numerator and denominator. What can you do with that?
What does a -1 power mean?

98= 2(?)