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katherinekc

  • 3 years ago

Write the expression in standard form. 7/ 3-15i A. 7/78 - 35/78i B. -7/78 - 35/78i C. 7/78 + 35/78i D. -7/78 + 35/78i

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  1. rahul91
    • 3 years ago
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    multiply numerator and denominator by the conjugate of denominator (3+15i). separate real and imaginary parts

  2. katherinekc
    • 3 years ago
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    so would the answer be C?

  3. katherinekc
    • 3 years ago
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    i'm confused :(

  4. rahul91
    • 3 years ago
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    u r right.. dnt confuse

  5. katherinekc
    • 3 years ago
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    so it is C.. ?

  6. rahul91
    • 3 years ago
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    yep

  7. katherinekc
    • 3 years ago
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    ohh ok thankyou!! by any chance would u no the answer to this.. Find the product of the complex number and its conjugate. 1 + 3i A. 1 + 9i B. 10 C. -8 D. 1 - 9i i kept getting 1-9i .. but im not sure?

  8. rahul91
    • 3 years ago
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    (1+3i)x(1-3i) is of the form (a+b)(a-b)=a^2-b^2 here a=1 and b=3i so a^2 - b^2=_________

  9. katherinekc
    • 3 years ago
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    = 10?

  10. rahul91
    • 3 years ago
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    yep

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