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Factor the following polynomial completely. -x2y2 + x4 + 9y2 - 9x2
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Factor the following polynomial completely. -x2y2 + x4 + 9y2 - 9x2

User Greut
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factor by grouping, -x2y2+9y2= y2(-x2+9)
x4-9x2=- x2(-x2+9)
= (y2-x2)(-x2+9)

User Oussama BEN MAHMOUD
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