Question

determine a funçao fx=x2-81​

Answer 1

Olá Nairs !

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➷ Cálculos:

$\\ \sf \: f(x) = {x}^{2} - 81 \\ \sf \: 0 = {x}^{2} - 81 \\ \sf \: - {x}^{2} = - 81 \\ \sf \: {x}^{2} = 81 \\ \sf \: x = ± 9$

➷ Resposta:

$\boxed{\boxed{\sf~f(x)~=~9}}$