Question

Find the value of k , for which the quadratic equations 9x²+3kx+4 has Equal roots​

Answer 1

for real and equal roots

discriminant=0

D= 0

on comparing this eq with standard form of quadratic equation

ax²+bx+c =0

we get,

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

D= 0

b²-4ac =0

(3k)²-4×9×4

9k² - 144 =0

9k² = 144

k² = 144/9

k=√144/9

k= 12/3

k= 4