Question

помогите решить (4 - 5✓2)^2

Answer 1

(4 - 5✓2)^2

$(4 - 5 sqrt{2} )^2 = 4^2 +(5 sqrt{2} )^2-2*4*5 sqrt{2} = \ =16+50-40 sqrt{2} =66-40 sqrt{2}$