Question

Resolva equação 2 grau x2+11x+30=0

Answer 1

a=1  b=11  c=30

Δ= 11² -4.1.30
Δ= 121-120 = 1

x = -11 +ou - √1 / 2.1
x1= -10/2 = -5

x2= -12/2 = -6

Answer 2

Explicação passo-a-passo:

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

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

$\sf \Delta=121-120$

$\sf \Delta=1$

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

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

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