Question

Which of the following equation has 2 as a root
a) x2 - 4x + 5 = 0
b) 2x2 - 7x + 6 = 0
c) x2 + 3x - 12 = 0
d) 3x² - 6x - 2 = 0​

Answer 1

Answer:

a

Step-by-step explanation:

x=(4±✓16-20)/(2)

=(4±✓-4)/2

=2±i

one root is 2+1i,2-1i