Question

(2squareroot 7- squareroot3)^2

Answer 1

(a-b)^2 = a^2 -2ab + b^2 alright

so you have \[(2\sqrt{7} - \sqrt{3})^{2}\]

= \[28 - 4\sqrt{21} + 3\]
= \[-4\sqrt{21} + 31\]