Assuming that this is the equation that you were meaning, here is the factoring completed. You could also factor out a -1 from the last two terms and rewrite as follows ( -(a^2-1)).

Treat "x^{2}" as a unit by itself (that is, let y = x^{2}, and rewrite your expression in terms of y. Now you can factor the quadratic. Finally, replace y with "x^{2}" to present your result.

Willard

^{2}" as a unit by itself (that is, let y = x^{2}, and rewrite your expression in terms of y. Now you can factor the quadratic. Finally, replace y with "x^{2}" to present your result.