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Question

The modulus of the complex number is (6+8i12i)

A
25
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B
5
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C
52
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D
25
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Solution

The correct option is A 25
z=6+8i12i=(6+8i)(1+2i)(12i)(1+2i)
=10+20i5=2+4i
|z|=(2)2+(4)2=25

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