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c) (x + y)^2 = (3 + 2V3 + 2 - 3V3)^2
= (5 - V3)^2 = (5 - V3)(5 - V3)
= 25 - 5V3 - 5V3 + 3
= 25 - 10V3 + 3
= 28 - 10V3
d) x^2 - xy = (3 + 2V3)^2 - (3 + 2V3)(2 - 3V3)
= (9 + 12V3 + 12) - (6 - 9V3 + 4V3 - 18)
= (21 + 12V3) - (-12 - 5V3)
= 21 + 12 + 12V3 + 5V3
= 33 + 17V3
Nb : ^ : pangkat ; V : akar