Question

Inversul  lui  3 - 2√2 este ...

Answer 1

$\dfrac{1}{3-2\sqrt2}=\dfrac{3+2\sqrt2}{(3-2\sqrt2)(3+2\sqrt2)}=$

$=\dfrac{3+2\sqrt2}{3^2-(2\sqrt2)^2}=\dfrac{3+2\sqrt2}{9-8}=3+2\sqrt2$