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3 March, 07:16

The graph of which function is decreasing over the interval (-4, ∞) ?

f (x) = (x + 4) 2 + 4

f (x) = - (x + 4) 2 + 4

f (x) = (x - 4) 2 - 4

f (x) = - (x - 4) 2 - 4

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Answers (1)
  1. 3 March, 08:25
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    Ok, logic

    all of them are parabolas

    1st and 3rd are opening up, so they defenitely increase, so no

    decraseing

    the vertex hs to be be at x=-4

    y=a (x-h) ^2+k

    h has to be - 4

    y=a (x+4) ^2+k

    the answer is 2nd one or f (x) = - (x+4) ^2+4
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