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= 7x^2 + 54xy + 54xy + 8y^2
= 7x^2 + 108xy +8y^2
(2a - 3b)^2 = (2a - 3b) (2a - 3b)
= 2a^2 - 6ab - 6ab + 9b^2
= 2a^2 -12ab + 9b^2
KET : ^2 = pangkat dua (2)