Solve for a, b
a=\frac{1-\sqrt{21}}{2}\approx -1.791287847\text{, }b=\frac{-\sqrt{21}-1}{2}\approx -2.791287847
a=\frac{\sqrt{21}+1}{2}\approx 2.791287847\text{, }b=\frac{\sqrt{21}-1}{2}\approx 1.791287847
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