Math Help now !!!! Plz

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Solve using the quadratic formula

  • Math Help now !!!! Plz -

    Learn the quadratic formula:

    x = [-b +/-sqrt(b^2 -4ac)]/2a

    In your case a = 1, b = -4 and c = -21

    x = [4 +/-sqrt(100)]/2

    You finish it. You surely know what the square root of 100 is.

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