Question

Faça o estudo do sinal da função f(x)= -5x+3

Answer 1

vamos lá...

f(x)= -5x +3

-5x+3=0
-5x=-3
5x=3
x=3/5

$---^{+}-- \frac{3}{5} --^{-}-- \\ ~~~~~c/a~~~~~~~~~~~~~~m/a \\ \\ y=0~~para~~x= \frac{3}{5} \\ \\ y\ \textgreater \ 0~~para~~\{x\in R|x\ \textless \ \frac{3}{5} \} \\ \\ y\ \textless \ 0~~para~~\{x\in R/x\ \textgreater \ \frac{3}{5} \}$