Question

Resolva equação 2 grau x2+11x+30=0

Answer 1

x^2+11x+30=0
delta=b^2-4ac
delta=11^2-4.1.30
delta=121-120
delta=1
x=-b-/+ raiz de delta/2a
x=-11-1/2.1
x=-12/2
x=-6
x=-11+1/2.1
x=-10/2
x=-5

Answer 2

Explicação passo-a-passo:

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

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

$\sf \Delta=121-120$

$\sf \Delta=1$

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

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

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