<p>hey all..
i came across this question on a PR practice test..
What is the value of |6-3i|
(A)-3
(B)3root2
(C)3root5
(D)9
(E)15</p>
<p>PR answers it by plotting a graph n everything.. i would like to know if theres any other way in finding the answer
thanks..</p>
<p>|a +bi| = sqrt(a^2 + b^2)</p>
<p>so |6-3i| = 3root5</p>
<p>Square 6 and add it to the square of 3. Find the root of the sum. That's the answer.</p>
<p>This is applicable for any a + ib.</p>
<p>The graph is only to help you understand it better, it won't help you solve the question.</p>
<p>i is the y-axis (imaginary part), and a is the x-axis (real part)</p>