Find ‘ k ’ for which quadratic equation 9x2 – 3 kx + k = 0 have equal roots .
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Answer:
k = 2
Step-by-step explanation:
9x2 - 3kx + k = 0
a = 9 , b = -3k , c = k
b2- 4ac = 0
(-3k)2 – 4(k)(9) = 0
9k2 - 36k = 0
9k2 = 36
k2 = 36/9
k2 = 4
k = √4
k = 2
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