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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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multiply numerator and denominator by the conjugate of denominator (3+15i). separate real and imaginary parts
so would the answer be C?
i'm confused :(

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Other answers:

u r right.. dnt confuse
so it is C.. ?
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?
(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=_________
= 10?

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