Question

Пример (2√7+3)^2. 8 класс.

Answer 1

Ответ:

${(2 \sqrt{7} + 3 )}^{2} = {(2 \sqrt{7}) }^{2} + 2 \times 2 \sqrt{7} \times 3 + {3}^{2} = \\ = 4 \times 7 + 6 \times 2 \sqrt{7} + 9 = \\ = 28 + 12 \sqrt{7} + 9 = 37 + 12 \sqrt{7}$