Question

|5-2sqrt{7}| * (5-2sqrt{7})-20sqrt{7}

Answer 1

$|5-2 sqrt{7}| *(5-2 sqrt{7})-20 sqrt{7}=(2 sqrt{7}-5)*(-(2sqrt{7}-5))-20 sqrt{7} =-(2 sqrt{7}-5)^2)-20 sqrt{7}=-(4*7-20 sqrt{7} +25)-20 sqrt{7} =-53+20sqrt{7}-20 sqrt{7} =-53$

Answer 2

ответ : -53