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Autumn Huels

Lvl 10
4y ago

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You would use the quadratic formula. x = -b +/- √b^2 - 4ac / 2a

x^2 - 4x - 21 = 0

a=1

b= -4

c= -21

Plug it into the quadratic equation and solve. :)

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Wiki User

14y ago
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Q: X squared - 4x - 21?
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