Question

como se resolve 8 - 4 raiz de 2 = x²

Answer 1

$8 - 4\sqrt{2}=x^2 \\\\ (8-4\sqrt{2}=x^2)^2 \\\\ 8^2 - 2.4\sqrt{2}.8 + (4\sqrt{2})^2=x^4 \\\\ 64 - 64\sqrt{2}+32=x^4 \\\\ 96 - 64\sqrt{2}=x^4 \\\\ \sqrt[4]{96-64\sqrt{2} }=x$