katherinekc
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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rahul91
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multiply numerator and denominator by the conjugate of denominator (3+15i).
separate real and imaginary parts
katherinekc
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so would the answer be C?
katherinekc
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i'm confused :(
rahul91
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u r right.. dnt confuse
katherinekc
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so it is C.. ?
rahul91
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yep
katherinekc
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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?
rahul91
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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=_________
katherinekc
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= 10?
rahul91
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yep