Question

dada a função f:r definida por f(x)=5-2x calcule a, f(-5/2) b,f(x)=19

Answer 1

a) F(-5/2) = 5 - 2(-5/2) = > 5- (-5) = 10

b) F(x)=19 => 5-2x=19 => 5-19 = 2x => 2x = -14 => x = -7

Fiim :D

Answer 2

$f(x)=5-2x\\\\A)~~f(-\frac{5}{2})=5-2.(-\frac{5}{2})\\f(-\frac{5}{2})=10\\\\B)~~f(x)=5-2x=19\\2x=5-19\\2x=-14\\x=-7\\\\Espero~ter~ajudado.$