[tex]2(x + 3) {}^{2} = 2( {x}^{2} + {3}^{2} ) = \\ = 2( {x}^{2} + 9) = 2x {}^{2} + 2 \times 9 = \\ = 2x {}^{2} + 18[/tex]
…ᘛ⁐̤ᕐᐷฅ^•ﻌ•^ฅ
