Find the value of K for which the given eqn.has real roots:
9x^2 + 3Kx + 4 = 0
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9x²+3kx+4=0
If the equation has real roots then b²-4ac>0
b²-4ac=(3k)²-4(9)(4)
=> =9k²-144>0
=>9k²=144
=>k²=144/9
=>k=√144/9
=>k=12/3
If the equation has real roots then b²-4ac>0
b²-4ac=(3k)²-4(9)(4)
=> =9k²-144>0
=>9k²=144
=>k²=144/9
=>k=√144/9
=>k=12/3
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