(3a-2c)^2+3c^2+10ac= Срочно

[latex](3a-2c)^2+3c^2+10ac=(3a)^2-2*3a*2c+(2c)^2+3c^2+10ac=[/latex] [latex]=9a^2-12ac+4c^2+3c^2+10ac=9a^2-2ac+7c^2[/latex]