Q3 of 168 Page 7

Find whether the following quadratic equations have a repeated root :
x² + 6x + 9 = 0

REPEATED ROOTS MEAN d = 0 .

d = b² – 4ac

d = (6)² – 4(1)(9)

d = 36 – 36

d = 0

∴ roots are repeated.

Find whether the following quadratic equations have a repeated root :

9x² + 4x + 6 = 0

Find whether the following quadratic equations have a repeated root :

16y²— 40y + 25 = 0

Comment upon the nature of roots of the following equations:

4x² + 7x + 2 = 0

Comment upon the nature of roots of the following equations:

x² + 10x + 39 = 0

Find whether the following quadratic equations have a repeated root :x2 + 6x + 9 = 0