Question

X ao quadrado + 5x + 4 = 0

Answer 1

X^2+5x+4=0
Delta=25-4 (1)(4)
Delta=9

-b+ou- raiz de delta/2a=

-5+3/2=-1
-5-3/2=-4

Answer 2

Resposta:

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

Explicação passo-a-passo:

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

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

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

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