# Find the modulus of each of the complex numbers 5i, 7, and 3 + 4i.

Find the modulus of each of the complex numbers 5i, 7, and 3 + 4i.
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Pohanginah
$|z|=\sqrt{{a}^{2}+{b}^{2}}$
therefore,the magnitude or modulus of the complex number 5i is:
we can write the complex number as 0+5i
therefore the magnitude or modulus of the complex number is $\sqrt{{0}^{2}+{5}^{2}}=\sqrt{{5}^{2}}=5$
therefore the magnitude or modulus of complex number 5i is 5
the magnitude or modulus of the complex number 7 is:
we can write the complex number as 7+0i
therefore the magnitude or modulus of the complex number is $\sqrt{{7}^{2}+{0}^{2}}=\sqrt{{7}^{2}}=7$
therefore the magnitude or modulus of complex number 7 is 7
the magnitude or modulus of the complex number 3+4i is:
therefore the magnitude or modulus of the complex number is $\sqrt{{3}^{2}+{4}^{2}}=\sqrt{9+16}=\sqrt{25}=5$
therefore the magnitude or modulus of complex 3+4i is 5.

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