Question

cat este (2+√3)la puterea 2 ​

Answer 1

____________________________________

= 7 + 4√3

$\it (a+b)^2=a^2+2ab+b^2\\ \\ \\ (2+\sqrt3)^2=2^2+2\cdot2\cdot\sqrt3+(\sqrt3)^2=4+4\sqrt3+3=7+4\sqrt3$