x^4-16y^4

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x^4-16y^4
x^4-16y^4

x^4-16y^4
x^4-16y^4
=(x^2+4y^2)*(x^2-4y^2)
=(x^2+4y^2)*(x+2y)*(x-2y)

=(x^2-4y^2)(x^2+4y^2)
=(x-2y)(x+2y)(x^2+4y^2)
16y^4=(2y)^4

x^4-16y^4
=(x^2+4y^2)*(x^2-4y^2)
=(x^2+4y^2)*(x+2y)*(x-2y)