Question

resolva a equação x²+2x-3=0​

Answer 1

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

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

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

S= ( - 3 , 1)