Question

Resolva equação 2 grau x2+11x+30=0

Answer 1

olá
a= 1 b= 11 c= 30

x²+11x+30=0 

∆=121-120=1, √1=1 

x= -b+ - \/∆ /2.a

x= - 11 + - \/1/2.a

{x'= -11-1/2=>
{x"= -11+1/2=>

=>x'= - 12/2= - 6 
=>x"= - 10/2= - 5 

s= {( - 6, -5)}

Answer 2

Explicação passo-a-passo:

$\sf x^2+11x+30=0$

$\sf \Delta=11^2-4\cdot1\cdot30$

$\sf \Delta=121-120$

$\sf \Delta=1$

$\sf x=\dfrac{-11\pm\sqrt{1}}{2\cdot1}=\dfrac{-11\pm1}{2}$

$\sf x'=\dfrac{-11+1}{2}~\Rightarrow~x'=\dfrac{-10}{2}~\Rightarrow~\red{x'=-5}$

$\sf x"=\dfrac{-11-1}{2}~\Rightarrow~x"=\dfrac{-12}{2}~\Rightarrow~\red{x"=-6}$