Expand the following & express your answer in simplest radical form

Question

Expand the following & express your answer in simplest radical form

(1-3√2)²

Answer 1

(1 - 3√2)(1 - 3√2) = 1 - (2)(3)(√2) + (3√2)^2

= 1 - 6√2 + (9)(2)

= 1 - 6√2 + 18

= 19 - 6√2