Each solution to x^2 + 5x + 18 = 0 can be written in the form a + bi where a and b are real numbers. What is a^2 + b^2?
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\(x^2 + 5x + 18 = 0\\ x=-2.5\pm \sqrt{6.25-18}\\ a+bi=-2.5\pm \sqrt{11.75}\cdot i\)
\(a^2+b^2=6,25-11.75\)
\(a^2+b^2=-5.5\)
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