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marierose3210
marierose3210 marierose3210
  • 08-01-2017
  • Mathematics
Answered

What is the answer to (4-i)(6-5i) ?

Verified Answer :

cdbuck
cdbuck cdbuck
  • 08-01-2017

for this we must use foil and multiply
46
4
-5i
-i6
-i
-5i
to get (respectively to above)
24
-20i
-6i
5i^2
combine all of those to get:
24-26i+5i^2
now, i squared is equal to -1, so we can simplify the above even further:
24-26i+5(-1)
24-26i-5
19-26i
Now, that would be your final answer. But if you want it in radical form you would get this: (just so you know, i is the square root of -1, or an imaginary number)
\(19-26 \sqrt{-1}\)

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