7. For what value of k, the equation have equal roots?
9.x2 + 6k + 4 = 0
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If equation has equal roots then,,
Discriminant (D) = 0
D = b² - 4ac = 0
==: 9x² + 6kx + 4 = 0
a = 9 , b = 6k , c = 4
D = 36k² - 144 = 0
(6k)² - (12)² = 0
(6k - 12) (6k + 12) = 0
k = 2
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