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7 December, 21:36

What are the solutions to m^2 - 9 = 0? a. m = - 9 and m = 0 b. m = - 3 and m = 3 c. m = - 3 d. m = 9

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  1. 7 December, 21:50
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    2 ways

    zero product property

    easy way

    zero product

    factor perfect square

    m^2-3^2=0

    (m-3) (m+3) = 0

    set each to zero

    m-3=0

    x=3

    m+3=0

    m=-3

    m=-3 or 3

    easy way

    add 9 to both sides

    m^2=9

    sqrt both sides remember to take postive and negative roots

    m=+/-3

    m=-3 or 3

    B is answer
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