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Zenmo

  • one year ago

Help with simple arithmetic.

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  1. Zenmo
    • one year ago
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    How does \[3(1-\sqrt{1+t})(1+\sqrt{1+t}) = -3t\] equal -3t? Show how please.

  2. Zenmo
    • one year ago
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    My arithmetic is a bit fuzzy in this area. Need a refresher.

  3. Nnesha
    • one year ago
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    :=)

  4. Nnesha
    • one year ago
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    \[\huge\rm 3 \color{blue}{(1-\sqrt{1+t})(1+\sqrt{1+t})} = -3t\] hint: \[\huge\rm (a+b)(a-b)=a^2-b^2\] apply this rule for both parentheses (blue part)

  5. Nnesha
    • one year ago
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    ahh i see wait a sec hmm

  6. Nnesha
    • one year ago
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    oh yeah nvm make sense ?

  7. Nnesha
    • one year ago
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    that's what i did first :P but yea remember we should distribute parentheses by negative one and then cancel out 1 |dw:1443969689374:dw|

  8. Nnesha
    • one year ago
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    |dw:1443969730628:dw|

  9. Zenmo
    • one year ago
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    ok I see it now. Thanks! :)

  10. Nnesha
    • one year ago
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    np :=)

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