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h) (3x - 2) 2 + 2(x +3) 2 = (9x2 - 4) + (2x + 6) 2 = 9x2 - 4 + 4x2 + 36 =
13x2 + 32
i) (y2 + 1) 2 - 2(y2 - 1) 2 = y4 + 1 - (2y2 - 1) 2 = y4 + 1 - 4y4 - 1 = -3y4
j) (5 - 0,2k3)2 + 5(k3 - 5) = 25 - 0,04k6 + 5k3 - 25 = -0,04 k6 + 5k3