Question

Estude o sinal da função f(x)=2x-4

Answer 1

Olá...

f(x) = 2x - 4

calcular zero ou raiz da função

2x - 4 =0
2x = 4
x = 4 ÷ 2
x=2

$---^----\circ^2---^+--- \\ ~~~~c/a~~~~~~~~~~~~~~~~~~~~~~m/a \\ \\ y=0,~~para~~x=2 \\ y\ \textless \ 0,~~para~~x\ \textless \ 2 \\ y\ \textgreater \ 0,~~para~~~x\ \textgreater \ 2$