Question

zero da função f(x)=x²-9

Answer 1

$f(x)=x^2-9\\\\\\ Para~~determinar~~o~~zero,~~a~~~fun\c c\~ao~~precisa~~ser~~nula:\\\\\\x^{2} -9=0\to \\\\ x^2=9\to\\\\ x=\pm \sqrt{9} \to\\\\ x=\pm 3\\\\\\\\ \large\boxed{\boxed{S=\{-3~;~3\}}}$