Expand : (x^2 + 9) (x^2 - 9)
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= x^4 - 81
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(x^2 + 9) (x^2 - 9)
= x^2(x^2 - 9) + 9(x^2 - 9)
= x^4 - 9x^2 + 9x^2 - 81
= x^4 - 81
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