Use the quadratic formula to solve x^2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

A.

{–12, 5}

B.

{–11.1, –2.9}

C.

{–5.6, –1.4}

D.

{–3.9, 12.1}

@GotToLoveJenny

Question

Use the quadratic formula to solve x^2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.
  
 
 

 
 

  

  A. 
 
{–12, 5}
   
   

 
 

  

  B. 
 
{–11.1, –2.9}
   
   

 
 

  

  C. 
 
{–5.6, –1.4}
   
   

 
 

  

  D. 
 
{–3.9, 12.1}
 
@GotToLoveJenny

anonymous · Answer

{-5.6,-1.4} Correct Answer: C

jdoe0001 · Answer

$\bf \textit{quadratic formula}\
y={\color{blue}{ 1}}x^2{\color{red}{ +7}}x{\color{green}{ +8}}
\qquad \qquad 
x= \cfrac{ - {\color{red}{ b}} \pm \sqrt { {\color{red}{ b}}^2 -4{\color{blue}{ a}}{\color{green}{ c}}}}{2{\color{blue}{ a}}}$