What are the solutions for 3x^2 +21=0

Could you please tell me the solutions with the imaginary numbers.
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1 Answer

3x^2 +21=0 use quadratic equation

[-b +or- sqrt(b^2 - 4ac)]/2a

a = 3 , b = 0 , c = 21

[+or- sqrt(4*3*21)]/2*3

[+or- sqrt(252)]/6

[+or- 6sqrt(7)]/6

+or- sqrt(7)

by Level 10 User (55.7k points)

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