Algebra

What is a^2 + b^2?

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$x^2 + 5x + 18 = 0 \\ x=-\frac{5}{2}\pm \frac{\sqrt{47}}{2}\cdot i$

          a          b

$a^2+b^2=\frac{25}{4}+\frac{47}{4}$

$a^2+b^2=6.25+11.75$

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