Question

If $f\left(x\right)=\frac{1}{\sqrt{x^2+1}}$ find $f\left(5\right)$

Answer 1

$f\left(x\right)=\frac{1}{\sqrt{x^2+1}}$

$f\left(5\right)=\frac{1}{\sqrt{5^2+1}}$

$f\left(5\right)=\frac{1}{\sqrt{26}}$