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

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