Question

a)(√7-√10)^2

b)(8-2√7)×(8+2√7)

Answer 1

A) 7 - 2 x V7 x V10 + 10 =
    7 - V70 + 10 =
  17 - V70... OK?

B) 8² - ( 2 V7 )² =
    64 - 4 X 7 =
    64 - 28 =
       36...OK?