Question

If f(x)=x²-9 then f(3) and f(√9)​

Answer 1

Answer:

$if \: f(x) = 3 \\ then \\ f(3) = {3}^{2} - 9 = 9 - 9 =0 \\ if \: f(x) = \sqrt{9} \\ then \\ \: f( \sqrt{9} ) = (\sqrt{9} ) {}^{2} - 9 \\ = 9 - 9 = 0$