jkasdhk
  • jkasdhk
minimum possible value of K for which the equation 2x^2+6x+K=0 has complex roots?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
for having complex roots Discriminant of quadratic equation must be less than zero then what is result?
jkasdhk
  • jkasdhk
its 9/2 (4.5)<0. Will the answer be 4?
UnkleRhaukus
  • UnkleRhaukus
\[2x^2+6x+K=0\] has complex roots when the discriminate is <0 \[\Delta=b^2-4ac\]\[=6^2-4\times1\times K\]

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UnkleRhaukus
  • UnkleRhaukus
because in the quadratic formula we have to take the square root of the discriminant , \[x=\frac{-b\pm\sqrt\Delta}{2a}\]
Callisto
  • Callisto
Little correction for the above post... Δ=b^2 - 4ac = (6)^2 - 4(2)(K) < 0 Now you need to solve this: (6)^2 - 4(2)(K) < 0

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