math

solve each equation
n^2-16=0

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  1. n = -4 or 4
    (-4)^2-16=0
    -4 x -4 = 16, so 16-16 = 0
    or
    4 x 4 = 16, so 16-16 = 0

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  2. (n-4)(n+4) = 0
    x = 4 or n = -4

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