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(V2 + V7)(V2 + V7) = V4 + V14 + V14 + V49 = 2 + 2V14 + 7 = 9 + 2V14
(3V2 - 2)(3V2+2) = 9V4 + 6V2 - 6V2 - 4 = 9 x 2 - 4 = 18 - 4 = 14
(2 - V2)(2 - V2)(2 - V2) = (4 - 2V2 - 2V2 + V4)(2 - V2) = (4 - 4V2 + 2)(2-V2) =
(6 - 4V2)(2 - V2) = 12 - 6V2 - 8V2 + 4V4 = 12 - 14V2 + 4 x 2 = 20 - 14V2