Math

how do i complete 2X squared minus X minus twenty one = 0?

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  1. Equations are easier to work out if you write them as equations, not with words.

    2x^2 -x -21 = 0
    This can be written as two factors:
    (2x -7)(x +3) = 0
    x = 7/2 or -3 are the answers

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