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How does this simplify?

How does this simplify?-example-1
User Poby
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\bf \cfrac{-6\pm√(40)}{2}\implies \cfrac{-6\pm√(2^2\cdot 10)}{2}\implies \cfrac{-6\pm 2√(10)}{2} \\\\\\ -3\pm√(10)
User Emitrax
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