Question

Solve (1+3√2) (1-3√2)

Answer 1

$(1 + 3 \sqrt{2} )(1 - 3 \sqrt{2} ) \\ \\ use \: (a + b)(a - b) = {a}^{2} - {b}^{2} \\ \\ = > (1 {)}^{2} - (3 \sqrt{2} ) {}^{2} \\ \\ 1 - 9 \times 2 \\ \\ 1 - 18 \\ \\ - 17$