Homework Help: math

Posted by Kevin on Tuesday, February 2, 2010 at 10:23am.

Why exactally does the absolute value of -3+4i = 5. I know (-3) squared plus (4i) squared = 5? Could you include a graphic approach as well? Thank you.

math - bobpursley, Tuesday, February 2, 2010 at 10:31am
i is an imaginary number. YOu can graph it only on the complex number plane.

Consider a rectangular graph, the x axis is the real numbers, and the y axis is imaginary numbers. THen you plot the point (-3,4). Find the distance from the origin, it is 5.

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