Question

the root of quadratic equation 9x^2+3k x+ 4 = 0 are equal if k is?? ​

Answer 1

Answer:

given quadratic equation is, 9x² + 3kx + 4 = 0

here,

a = 9 , b = 3k , c = 4

there is a condition for equal roots

that is, b² - 4ac = 0

=> ( 3k)² - 4*9*4 = 0

=> 9k² = 16*9

=> k² = 16

= > k = =√16 = ± 4

so, for equal roots,

k = 4 or , -4 .

Answer 2

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