How do you factor the expression x^3+121x?

1 Answer
Jan 9, 2016

You find the common factor in all terms.

Explanation:

We can rewrite the expression as products:

color(red)(x)*x*x+121*color(red)x

We can see that both terms are mutiplying x, so:

x(x*x+121)=x(x^2+121)

Also, if you wish to simplify the number, in this case you're fortunate for being able to do so, as 11^2=121:

x^3+121x=x(x^2+11^2)