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How do you factor #-x^2y^2 + x^4 + 4y^2 - 4x^2 #?

1 Answer

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)#

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