Question

simplify the following

Answer 1

By identity,
(a - b)^2 = a^2 + b^2 -2ab


(2 - √3)^2

(2)^2 + (√3)^2 - 2(2×√3)

4 + 3 - 4√3

7 - 4√3



$.$


I hope this will help you

(-:

Answer 2

$we \: know \: that \: ( {x - y)}^{2} = {x}^{2} + {y}^{2} - 2xy \\ = {2}^{2} + ({ \sqrt{3} )}^{2} - 2 \times 2 \times \sqrt{3} \\ = 4 + 3 - 4 \sqrt{3} \\ = 7 - 4 \sqrt{3}$
Hope it helps.