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x^{4}+x^{2}-\left(x^{4}+x^{2}\right)
Use the distributive property to multiply x^{2} by x^{2}+1.
x^{4}+x^{2}-x^{4}-x^{2}
To find the opposite of x^{4}+x^{2}, find the opposite of each term.
x^{2}-x^{2}
Combine x^{4} and -x^{4} to get 0.
0
Combine x^{2} and -x^{2} to get 0.
-x^{2}\left(x^{2}+1\right)+\left(x^{2}+1\right)x^{2}
Factor out x^{2}+1 in x^{4}+x^{2}.
x^{2}\left(-\left(x^{2}+1\right)+x^{2}+1\right)
Factor out common term x^{2} by using distributive property.
0
Consider -\left(x^{2}+1\right)+x^{2}+1. Simplify.