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Mathematics 3 Online
OpenStudy (anonymous):

If z = (15 + 8i) ÷ (3 - 4i), then |z| = _____.

OpenStudy (freckles):

you can multiply bottom and top of what is called z by the conjugate of the bottom that is (3+4i)

OpenStudy (freckles):

and then you will be able to put z in the form a+bi and then |z|= sqrt(a^2+b^2)

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