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

1 Answer
Guilherme N.
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)#

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