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anonymous

  • 5 years ago

what would the range be on f(x) = -4 l x+7 l ?

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  1. TuringTest
    • 5 years ago
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    what is the range on f(x)=|x+7| ?

  2. anonymous
    • 5 years ago
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    i think i'm not sure somehow my teacher got (- infinity, 0] and i have no idea what he did

  3. TuringTest
    • 5 years ago
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    what is the range of f(x)=|anything| ? what values can an absolute value take on?

  4. anonymous
    • 5 years ago
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    im sorry i'm so confused i know the domain is all reals because nothing limits it but i also thought hte range would be like all reals as well yet he gave us a diff answer so im unsure what to do

  5. TuringTest
    • 5 years ago
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    can |x| be negative?

  6. anonymous
    • 5 years ago
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    noooo

  7. TuringTest
    • 5 years ago
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    so then the range is not all reals, is it? it can't be negative, the least it can be is zero. It can be as big as you want though by putting in larger and larger x. so the range of f(x)=|x+7| is [0,infty) , agreed?

  8. anonymous
    • 5 years ago
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    well even if x is a negative number wouldnt it not matter because the absolute value makes it postivie?

  9. TuringTest
    • 5 years ago
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    right, so that means it \[|x|\ge0\]like I said, the LEAST it can be is zero. Hence the range is from zero to positive infinity\[[0,\infty)\] So far so good ?

  10. anonymous
    • 5 years ago
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    OH okay gotcha now

  11. TuringTest
    • 5 years ago
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    now what about\[f(x)=-|x|\]if |x| is always positive, then -|x| is always negative. The MOST it can be is zero. We can make f(x) very negative (as negative as we want in fact) by putting in very large negative or positive x. Hence the range is\[(-\infty,0]\](I hope you see that the 7 and 4 change nothing, only the fact that the 4 is negative matters) Make sense now?

  12. anonymous
    • 5 years ago
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    yes it does thank you so much you're a life saver

  13. TuringTest
    • 5 years ago
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    happy to help :)

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