Question

F(x)=-3x elevado a 2+6x

Answer 1

$f(x)=-3x^2+6x \\ \\ -3x^2+6x=0~~\times(-1) \\ \\ 3x^2-6x=0 \\ \\ colocar~~x~~como~~fator~~comum \\ \\ x(3x-6=0 \\ \\ 3x-6=0~~~~~~~x=0 \\ 3x=6 \\ x=6\div3 \\ x=2 \\ \\ S=\{0,2\}$

Answer 2

f(x)=3x²+6x
f(-1)=3.(-1)²+6.(-1)=3-6=-3
f(0)=3.0²+6.0=0+0=0
f(1)=3.1²+6.1=3+6=9
f(2)=3.2²+6.2=12+12=24

(-1,-3)(0,0)(1,9)(2,24)