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jkasdhk
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minimum possible value of K for which the equation 2x^2+6x+K=0 has complex roots?
 2 years ago
 2 years ago
jkasdhk Group Title
minimum possible value of K for which the equation 2x^2+6x+K=0 has complex roots?
 2 years ago
 2 years ago

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mukushla Group TitleBest ResponseYou've already chosen the best response.0
for having complex roots Discriminant of quadratic equation must be less than zero then what is result?
 2 years ago

jkasdhk Group TitleBest ResponseYou've already chosen the best response.0
its 9/2 (4.5)<0. Will the answer be 4?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[2x^2+6x+K=0\] has complex roots when the discriminate is <0 \[\Delta=b^24ac\]\[=6^24\times1\times K\]
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
because in the quadratic formula we have to take the square root of the discriminant , \[x=\frac{b\pm\sqrt\Delta}{2a}\]
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
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
 2 years ago
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