Question

Which number in the monomial 215x^18y^3z^21 needs to Be changed to make it a perfect cube ?

Answer 1

the answer is 215

Explanation:

Answer 2

Hello from MrBillDoesMath!

Answer: 215

Discussion:

Let's start by rewriting the monomial as

215 x^18 y ^3 z^21

Now..

x^ 18 = (x^6)^3

y^3 = (y )^3

z^21 = (z^7)^3

So those terms are already cubes! The only remaining candidate is the number 215, which is not a cube.

Thank you,

MrB