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anonymous

  • 4 years ago

please REALLY help question is on attachment!!!!

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  1. anonymous
    • 4 years ago
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    RATINONLIZE THE DENOMINTOR

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  2. anonymous
    • 4 years ago
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    if we simplify the bottom we get \[\sqrt{7}-2\]

  3. anonymous
    • 4 years ago
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    did you already combine like terms in the denominator?

  4. anonymous
    • 4 years ago
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    we have to multiply by its conjugate \[\sqrt{7}+2\] to get rid of the radical on the bottom, to make the equation stay equal we multiply by the conjugate/conjugate which equals 1, anything times 1 is itsself so it doesnt change the equation

  5. anonymous
    • 4 years ago
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    the top (5) times the conjugate is \[5\sqrt{7} + 10\]

  6. anonymous
    • 4 years ago
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    on the bottom it is \[3\]

  7. anonymous
    • 4 years ago
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    so we have |dw:1327711885632:dw|

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