Q3 of 168 Page 7

Find whether the following quadratic equations have a repeated root :
9x² + 4x + 6 = 0

REPEATED ROOTS MEAN d = 0.

d = b² – 4ac

d = (4)² – 4 (9) (6)

d = 16 – 216

d = –200

∴ roots are not repeated.

Find whether the following quadratic equations have a repeated root :

9x²— 12x + 4 = 0

Find whether the following quadratic equations have a repeated root :

y² — 6y + 6 = 0

Find whether the following quadratic equations have a repeated root :

16y²— 40y + 25 = 0

Find whether the following quadratic equations have a repeated root :

x² + 6x + 9 = 0

Find whether the following quadratic equations have a repeated root :9x2 + 4x + 6 = 0