How do you graph the number 7 - 5i in the complex plane and find its absolute value?

1 Answer
Jan 21, 2016

I found a value of #8.6#

Explanation:

On the complex plane you use the horizontal axis to plot the number of the real part (#7#) and the vertical one for the imaginary (#-5#):

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The absolute value, I think, would be the modulus of your number, i.e., the distance #rho# from the origin to the point representative of your number that we can find using Pythagoras:
#rho=sqrt(7^2+(-5)^2)=sqrt(49+25)=8.6#