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# Help fp1 watch

1. sorry i just dont get it... edexcel FP1 exercise 1E question 5 (page 18)

argument of -8-7i

i end up with 3.86.... answer is somehow -2.42.... help?
2. (Original post by bong)
sorry i just dont get it... edexcel FP1 exercise 1E question 5 (page 18)

argument of -8-7i

i end up with 3.86.... answer is somehow -2.42.... help?
Draw yourself a diagram of your complex number on an Argand diagram and then mark out the argument of that and then mark the angle you actually work out by doing and it should become apparent what you need to do to get the argument.
3. Also remember that you'd usually put your answer (theta) between -pi and +pi (called the principle argument)

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Updated: September 28, 2011
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