Question

9³-(raiz324×8)+21 como que resolver ??

Answer 1

$9^{3} - (\sqrt{324*8}) +21\\(3^{2})^{3} - (\sqrt{2^{2} *3^{2} *3^{2}*2*2^{2} } ) +21\\3^{6} - (2*3*3*2\sqrt{2} )+21\\729 +21 -36\sqrt{2}\\750 -36\sqrt{2}$