Question

Calcule os zeros das seguintes funções e esboce os graficos:
f(x)=x+2
f(x)=-1-3x
f(x)=-1+3x

Answer 1

$\displaystyle 1) f(x)=0\implies x+2=0\implies x=-2\\\\2)f(x)=0\implies -1-3x=0\implies -3x=1\implies -x=\frac{1}{3}(-1)\implies\\x=-\frac{1}{3}\\\\3)f(x)=0\implies -1+3x=0\implies 3x=1\implies x=\frac{1}{3}$