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23 June, 09:11

The zeros of the function f (x) = (x+2) ^2-25

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  1. 23 June, 12:05
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    Diffrence of 2 perfect squraes

    a^2-b^2 = (a-b) (a+b)

    (x+2) ^2 - (5) ^2 = (x+2-5) (x+2+5) = (x-3) (x+7)

    set to zero

    x-3=0

    x=3

    x+7=0

    x=-7

    zeoes are x=3 and - 7
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