Question

encontre as raízes X elevado a 2 + 8x + 7 = 0​

Answer 1

Delta = 8² - 4.1.7

D = 64 - 28

D = 36

$x = \frac{ - 8 + - \sqrt{36} }{2 \times 1}$

$x = \frac{ - 8 + - 6}{2}$

$x = \frac{ - 8 +6 }{2} = - 1 \\ x = \frac{ - 8 - 6}{2} = - 7$

Raízes -1 e -7

Answer 2

Olá, Bom Dia!!

x² + 8x + 7 = 0

A= 1

B= 8

C= 7

∆= b² - 4ac

∆= 8² - 4 • 1 • 7

∆= 64 - 28

∆ = 36

x= - b ± √∆ / 2a

x= - 8 ± √36 / 2 • 1

x'= - 8 + 6/2 = 2/2 = 1

x'' = - 8 - 6/2 = -14/2 = - 7

S= ( 1 , - 7)