abrothatneedshelp
abrothatneedshelp abrothatneedshelp
  • 03-09-2019
  • Mathematics
contestada

find the discrimanant and the number of real roots for this equation x^2+2x+8=0

A. 32; two real roots
B. -28; no real roots
C. 32 one real root
D. -28; one real root​

Respuesta :

jdoe0001 jdoe0001
  • 03-09-2019

[tex]\bf \qquad \qquad \qquad \textit{discriminant of a quadratic} \\\\\\ \stackrel{\stackrel{a}{\downarrow }}{1}x^2\stackrel{\stackrel{b}{\downarrow }}{+2}x\stackrel{\stackrel{c}{\downarrow }}{+8}=0 ~~~~~~~~ \stackrel{discriminant}{b^2-4ac}= \begin{cases} 0&\textit{one root}\\ positive&\textit{two roots}\\ negative&\textit{no real roots}~~\textit{\Large \checkmark} \end{cases} \\\\\\ (2)^2-4(1)(8)\implies 4-32\implies -28[/tex]

Answer Link

Otras preguntas

Identify the subject as too broad, adequate, or too narrow. The Feeding Habits of the Golden Finch
in dividing a decimal by a decimal what is 8.4 divided by 0.03 showing your work and explaining
In ancient Egypt, the pharaoh decided how to distribute surplus crops. Which of the following does this demonstrate? (4 points).
what skills and experience does a spy need?
Which of the following conditions would cause the salinity of ocean water to decrease? A. high rates of evaporation B. melting of glaciers C. erosion of rocks a
which of the following represents a way technology helped the Aztec empire grow economically? a.the aztecs made conquered peoples pay tributes b.the aztecs buil
As a mixed number , 240% is equal to.......
what is dyslexia?and how can a person like orlando bloom overcome it. (read an article about orlando bloom) and answer the question
What does shrewd mean? Smart Nasty Crazy
What were the causes of the crusades?