Resolve into factors:
I)4x^4+81
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4x^4+81
=(2x^2)^2+9^2
=(2x^2+9)^2-2×2x^2×9
=(2x^2+9)^2-36x^2
=(2x^2+9)^2-(6x)^2
=(2x^2-6x+9)(2x^2+6x+9)
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