Question

(7-\sqrt{3} )$(7- \sqrt{3} )$²

Answer 1

7²-2x7x√3+3
49-2x7x√3+3
52-2x7x√3
52-14x√3=27,75

Answer 2

$(7- \sqrt{3} )^2= \\ =7^2-2*7* \sqrt{3} + \sqrt{3} ^2= \\ =49-14 \sqrt{3} + \sqrt{9}= \\ =49-14 \sqrt{3} +3= \\ =-14 \sqrt{3} +52$