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mukushla Group Title

Range of\[f(x)=\sqrt{x^2+x+2}-\sqrt{x^2+x+1}\]

  • 2 years ago
  • 2 years ago

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  1. hartnn Group Title
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    \[f(x)=\sqrt{x^2+x+2}-\sqrt{x^2+x+1}\]

    • 2 years ago
  2. mukushla Group Title
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    yeah

    • 2 years ago
  3. Yahoo! Group Title
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    Range = Real Numbers

    • 2 years ago
  4. sauravshakya Group Title
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    I think |dw:1347709678855:dw|

    • 2 years ago
  5. mukushla Group Title
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    thats it

    • 2 years ago
  6. mukushla Group Title
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    what is ur approach?

    • 2 years ago
  7. estudier Group Title
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    always positive, diff for max

    • 2 years ago
  8. sauravshakya Group Title
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    x^2+x+2=(x+1/2)^2 +7/4 x^2+x+1=(x+1/2)^2+3/4 Now, f(x) is maximum when (x+1/2)^=0 because the f(x) value decresases as (x+1/2)^2 is greater than 0 since |dw:1347710167952:dw| Now, when (x+1/2)^2 ---->approaches infinity f(x) will be minimum but will never be zero.....but will be very close to zero

    • 2 years ago
  9. sauravshakya Group Title
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    Sorry not good at expalining things

    • 2 years ago
  10. sauravshakya Group Title
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    But I think thats it

    • 2 years ago
  11. mukushla Group Title
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    \[f(x)=\frac{1}{\sqrt{x^2+x+2}+\sqrt{x^2+x+1}}\]

    • 2 years ago
  12. sauravshakya Group Title
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    Is that another question?

    • 2 years ago
  13. mukushla Group Title
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    no this is same

    • 2 years ago
  14. sauravshakya Group Title
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    ?

    • 2 years ago
  15. mukushla Group Title
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    \[f(x)=\sqrt{x^2+x+2}-\sqrt{x^2+x+1}\times\frac{\sqrt{x^2+x+2}+\sqrt{x^2+x+1}}{\sqrt{x^2+x+2}+\sqrt{x^2+x+1}}\]

    • 2 years ago
  16. hartnn Group Title
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    just rationalizing the denom, isn't it ?

    • 2 years ago
  17. mukushla Group Title
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    yes

    • 2 years ago
  18. sauravshakya Group Title
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    Oh ya

    • 2 years ago
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