Question

(√(7) + 1)^2 - 2 √(7)

Answer 1

Ответ:

(7+2×√7×1+1)-2√7= 8+2√7-2√7=8

Answer 2

Ответ:

(√(7) + 1)^2 - 2 √(7)  = (√7+1)^2 - 2√7 = 7 + 2√7 + 1 - 2√7 = 7 + 1 = 8.