Question

equações X ao quadrado +5x+4=0

Answer 1

X²+5x+4=0 
5²-4.1.4
25-16
Δ= 9 

-5+-√9/2

X'= -5+3/2 = -2/2 = -1 

X''= -5-3/2 = -8/2 = -4 

S[-1,-4]

Answer 2

Resposta:

$S=\{-4,\:-1\}$

Explicação passo-a-passo:

$x^{2} +5x+4=0\\\\a=1\\b=5\\c=4$

$\Delta=b^{2} -4ac\\\Delta=5^{2}-4\times1\times4\\\Delta=25-16\\\Delta=9$

$x=\frac{-b\pm\sqrt{Delta} }{2a} \\\\x=\frac{-5\pm\sqrt{9} }{2\times1} \\\\x=\frac{-5\pm3}{2}$

$x_{1} =\frac{-5+3}{2} =-\frac{2}{2} =-1\\\\x_{2} =\frac{-5-3}{2} =-\frac{8}{2} =-4$