Question

dada a funçao exponencial f(x)=4 elevado a x elevado a -2 , determine f(4) - f(3)

Answer 1

$f(x) = 4 {}^{x {}^{ - 2} }$
$f(x) = 4 {}^{ \frac{1}{ {x}^{2} } }$
$f(x) = \sqrt[ {x}^{2} ]{4}$
$f(4) = \sqrt[16]{4} = \sqrt[8]{2} = 1.09051$

$f(3) = \sqrt[9]{4} = 1.16653$

f(4)-f(3)=1.09051-1.16653=-0.0760231