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10 May, 14:04

Solve the equation x^2-4x-21=0

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  1. 10 May, 15:43
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    x = 7 and x = - 3

    Step-by-step explanation:

    x^2-4x-21=0

    you can factor to get

    (x-7) (x+3) = 0

    then set each equal to 0

    x - 7 = 0 and x + 3 = 0

    then just solve for x!

    x = 7 and x = - 3
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