Factorise: -1x^2y^2+x^4-2y^4
\(x^{4}-x^{2}y^{2}-2y^{4}\)\(=x^{4}-2x^{2}y^{2}+x^{2}y^{2}-2y^{4}\)\(=x^{2}(x^{2}-2y^{2})+y^{2}(x^{2}-2y^{2})\)\(=(x^{2}-2y^{2})(x^{2}+y^{2})\)
-x^2y^2(1-x^2+2y^2)hope this helps
