simplify root number
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(-3+√5)(-3-√5)
= -3(-3-√5)+√5(-3-√5)
= 9+3√5-3√5-√25
=9+0-5
= 4
= -3(-3-√5)+√5(-3-√5)
= 9+3√5-3√5-√25
=9+0-5
= 4
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