Question

x²-2x-3=0??? obs: usando a fórmula de baskara

Answer 1

Delta = -2² - 4(1)(-3) = 4 + 12 = 16
x = -(-2) +- raiz de 16
      ------------------------
                 2(1)
X= 2 +- 4
     --------
         2
x1= 2+4 = 6/2 = 3

x2= 2-4 = -2/2

                 

Answer 2

x² - 2x - 3 = 0

A= 1

B= - 2

C= - 3

∆= b² - 4ac

∆= (-2)² - 4 • 1 • ( - 3)

∆= 4 + 12

∆= 16

x= - b ± √∆ / 2a

x= - ( - 2) ± √16 / 2 • 1

x= 2 ± 4 / 2

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

x"= 2 - 4 / 2 = - 2/2 = - 1

S= ( - 1 ; 3)