Question

реши уравнения:
x^2-2x-3=0​

Answer 1

x² - 2x - 3 = 0

D = b² - 4ac = 4 + 12 = 16

X1 , X2 = ( - b ± √D )/2 = ( 2 ± √16 ) / 2

X1 = ( 2 + 4 ) / 2 = 6 / 2 = 3

X2 = ( 2 - 4 ) / 2 = ( - 2 ) / 2 = ( - 1 )

X1 = 3 , X2 = ( -1 )