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

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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