Clarify your complex basic!

Algebra Level 2

x2+18x+90=0\large x^2 + 18x + 90 = 0

Find the value(s) of xx satisfying the equation above.

If the answers are of the form aib-ai - b and aibai - b, with positive aa, submit your answer as a+ba+b.

Clarification: i=1i=\sqrt{-1}.

Bonus: Try to solve it without using the quadratic formula.


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