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evergirl

  • 3 years ago

Rationalize the denominator of ..........

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  1. evergirl
    • 3 years ago
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  2. mark_o.
    • 3 years ago
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    \[\frac{ 4 }{ 2+7i }*\frac{ 2-7i }{ 2-7i }\] \[\frac{ 8-28i }{ ? }\] can you try to do the denominator

  3. mark_o.
    • 3 years ago
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    what did you get?... :D

  4. mark_o.
    • 3 years ago
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    the numerator is = 4(2-7i) = 8-28i yes or no? next the denominator is = (2+7i)(2-7i)= ______________?

  5. mark_o.
    • 3 years ago
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    if we have (a+b)(a-b)=a^2-b^2 also if we have (a+bi)(a-bi)=[a^2-(bi]^2 did you get this one ? yes or no?... :D

  6. mark_o.
    • 3 years ago
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    @ evergirl what did you get?

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