If a and b are the roots of x^2 + x - 3, then find 4b^2 - a^3.
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\(x^2 + x - 3=0\\ x=-0.5\pm \sqrt{0.25+3}\\ x=-0.5\pm 0.5\sqrt{13}\)
\(a=-0.5+0,5\sqrt{13}\\ b=-0.5-0.5\sqrt{13}\)
\(\large4b^2 - a^3=19\)
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