A few days ago
HELP with algebra II?
For which value of K is the product of 5 +3i and 20 +Ki a real number.
ANSWER OPTIONS:
A. -12
B.-3
C. 3
D. 12
Top 2 Answers
A few days ago
Favorite Answer
The i terms would have to cancel out (inner and outer from FOIL). Right now the inner would be 60i so the outer, Ki times 5, must come out -60i, so figure out what times 5 = -60. That’s K
0
A few days ago
Multiply out to get 100 – 3K + (60 + 5K)i
If this is to be real then the imag part must be 0
60 + 5K = 0
So it’s answer A, isn’t it
0
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