(3t – 7)(1 + 3t^2) =
= 3t xx 1 + 3t xx 3t^2 + (-7) xx 1 + (-7) xx 3t^2 =
= 3t + 9t^3 – 7 – 21t^2 =
= 9t^3 – 21t^2 + 3t - 7

Question

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