Question

(√7-1)×(√7-5) Помогите решить!

Answer 1

$( \sqrt{7} - 1)( \sqrt{7} - 5) = {( \sqrt{7} )}^{2} - 5 \sqrt{7} - \sqrt{7} + 5 = 7 - 6 \sqrt{7} + 5 = 12 - 6 \sqrt{7}$

Answer 2

$( \sqrt{7} - 1) \times ( \sqrt{7} - 5) = 7 - 5 \sqrt{7} - 1 \sqrt{7} + 5 = 12 - 5 \sqrt{7} - 1 \sqrt{7} = 12 - 6 \sqrt{7}$