How do you factor #x^4 - 13x^2 - 30#?
2 Answers
Explanation:
To factor it, first find a pair of factors of
That gives us:
The first of these quadratic factors can be considered a difference of squares:
using the difference of squares identity:
The second factor
(If you have never used
Explanation:
I'll call
We notice that
let
So the equation becomes:
(if you had eyes wide open, you could notice that
i.e.
So we factored the polynomial in
We notice that
If you work in
So
If you work in
So
(If you have never used