Question

F(x)=x 2 +6x+8
1) Quais são as raízes da função?
Escreva, primeiramente, o menor; e, depois, o x maior
menor r =
maior =
2) Qual é o vértice da parábola​

Urgente !!!

Answer 1

Resposta:

$1)S=\{-2,4\}~\\\\b)V(-3,-1)$

Explicação passo-a-passo:

$f(x)=x^2+6x+8\\a=1;b=6;c=8\\\Delta=b^2-4ac\\\Delta=6^2-4.1.8\\\Delta=36-32\\\Delta=4\\\\x=\frac{-b-\sqrt{\Delta} }{2a}\\\\x=\frac{-6-\sqrt{4} }{2}\\\\x=\frac{-6-2}{2}\\\\x=\frac{-8}{2}\\\\x=-4 \\\\x=\frac{-6+2}{2} \\\\x=\frac{-4}{2}\\\\x=-2\\\\S=\{-2,4\}$$2)x_V=\frac{-b}{2a}\\ \\x_V=\frac{-6}{2.1} \\\\x_V=\frac{-6}{2}\\\\x_V=-3\\\\y_V=\frac{-\Delta}{4a}\\\\y_V=\frac{-4}{4.1}\\\\y_V=\frac{-4}{4} \\\\y_V=-1\\\\V(-3,-1)$