Question

x ao quadrado + 2x - 8 = 0 ​

Answer 1

resolução!

${x}^{2} + 2x - 8 = 0$

∆ = 2^2 - 4 * 1 * (-8)

∆ = 4 + 32

∆ = 36

∆ =√36

∆ = 6

X ' = - 2 + 6/2

X ' = 4/2

X ' = 2

X " = - 2 - 6/2

X " = - 8/2

X " = - 4

S = { - 4 , 2 }

Answer 2

x² + 2x - 8 = 0

A= 1

B= 2

C= - 8

∆= b² - 4ac

∆= 2² - 4 • 1 • ( - 8)

∆= 4 + 32

∆= 36

X= - B ± √∆/2A

x= - 2 ± √36/2 • 1

x= - 2 ± 6/2

x'= - 2 + 6/2 = 4/2 = 2

x''= - 2 - 6/2 = - 8/2 = - 4

S= ( - 4 , 2)