How do you factor #-x^2y^2 + x^4 + 4y^2 - 4x^2 #? Algebra Polynomials and Factoring Monomial Factors of Polynomials 1 Answer Manikandan S. Feb 2, 2016 Combination Explanation: We have the equation as #f(x,y) = -x^2y^2+x^4+4y^2-4x^2# # = x^4-x^2y^2-4x^2+4y^2# # = x^2(x^2-y^2)-4(x^2-y^2)# # = (x^2-y^2)\times (x^2-4)# Answer link Related questions What are Monomial Factors of Polynomials? How do you factor polynomials by finding the greatest common factor? How can a factoring problem be checked? How do you find the greatest common factors of variable expressions? How do you factor #3a+9b+6#? What is the greatest common factor of #a^3-3a^2+4a#? How do you factor #12xy+24xy^2+36xy^3#? How do you find the greatest common factor of #45y^{12}+30y^{10}#? How do you factor #92x^10y^4 - 54x^12y^9#? How do you factor #4x^2+x#? See all questions in Monomial Factors of Polynomials Impact of this question 2733 views around the world You can reuse this answer Creative Commons License