Question

for what values of k, the equation 9x2+4kx+4=0 has equal roots​

Answer 1

b^2-4ac=0

4k^2-4×9×4=0

16k^2-144=0

16k^2=144

k^2=144/16

k=√(144/16)

k=12/4=3/1

k=3

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