Question 68797
factor polynomial.  They say:
(x^2+y^2)^2-(y^2-z^2)^2
This follows the form a^2-b^2=(a-b)(a+b)
You get:
[(x^2+y^2)+(y^2-z^2)]*[(x^2+y^2)-(y^2-z^2)]

Cheers,
Stan H.