Clarify your complex basic!

Algebra Level 2

\[\large x^2 + 18x + 90 = 0\]

Find the value(s) of \(x\) satisfying the equation above.

If the answers are of the form \(-ai - b\) and \(ai - b\), with positive \(a\), submit your answer as \(a+b\).

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

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


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