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Answer:Third choice is the correct oneExplanation:We are asked to use the u substitution. Therefore, we will assume that:u = x^2Substitute with u in the given expression as follows:9x^4 - 2x^2 - 7 = 09u^2 - 2u - 7 = 0(u-1)(9u+7) = 0either u = 1or u = -7/9Now, u = x^2, this means that:at u = 1:x^2 = 1x = ± √1 = ±1at u = -7/9x = ±i√7/9 (the i indicates the imaginary value)Hope this helps :)

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