Question

x ao quadrado + 2 ( x+1)= 5​

Answer 1

x² + 2(x + 1) = 5

x² + 2x + 2 = 5

x² + 2x + 2 - 5 = 0

x² + 2x - 3 = 0

A= 1

B= 2

C= - 3

∆= b² - 4ac

∆= 2² - 4 • 1 • ( - 3)

∆= 4 + 12

∆= 16

x= - b ± √∆ / 2a

x= - 2 ± √16 / 2 • 1

x'= - 2 + 4/2 = 2/2 = 1

x''= - 2 - 4/2 = - 6/2 = - 3

S= ( - 3 , 1)