1.

For what value of k does the equation 9x^2+3kx+4=0 has equal roots

Answer»

Here,
a=9
b=3K
c=4
b^2-4ac=0 (Since the roots are SUPPOSED to be equal)
=>{3k}^2-4(9)(4)=0
=>9k^2-144=0
=>9k^2=144
=>k^2=144/9=16
Hence k=4 or -4.


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