Question

Considere a função f dada por f(x)= 5 +3/x+2 definida em R- {-2}. Determine:

 

a)f(-5)

b)f(4)

 

Ola por favor me ajudem!

Answer 1

$<var>f (-5) = 5 + \frac{3}{x + 2}\\\\ f (-5) = 5 + \frac{3}{(-5) + 2}\\\\ f (-5) = 5 + \frac{3}{-3}\\\\ f (-5) = 5 + (-1)\\\\ f (-5) = 5 - 1\\\\ f (-5) = 4\\\\\\\\ </var>$

 

$<var>f (4) = 5 + \frac{3}{x + 2}\\\\ f (4) = 5 + \frac{3}{4 + 2}\\\\ f (4) = 5 + \frac{3}{6}\\\\ f (4) = 5 + \frac{1}{2}\\ \\ f (4) = 5,5\\ </var>$