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=(3a)^2 - 2.3a.2 + 2^2) - (a^2 - 2.a.1 + 1)
=(9a^2 - 12a + 4) - (a^2 -2a + 1)
= 9a^2 - a^2 - 12a + 2a +4 -1
= 8a^2 -10a + 3
Klik
= 9a²-12a+4-a²+2a-1
= 8a²-10a+3