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Expand (3x − 1)(3x + 1)

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Answer to a math question Expand (3x − 1)(3x + 1)

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Use foil method \left(3x\right)\left(3x\right)+3x\left(1\right)+\left(-1\right)\left(3x\right)+\left(-1\right)\left(1\right) 9x^2+3x-3x-1 Combine like terms Answer\:=\:9x^2-1

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