How do you find $| - 1 + 2 i |$ $abs( -1 + 2i )$ ?

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How do you find $| - 1 + 2 i |$ $abs( -1 + 2i )$ ?

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Answer 1 · 2016-03-19T11:08:00

$\sqrt{5}$ $sqrt5$

Explanation:

Given a complex number z = x + iy then the magnitude is

|z| = |x +iy| $= \sqrt{x^{2} + y^{2}}$ $= sqrt( x^2 + y^2)$

here x = -1 and y = 2

hence |-1 + 2i| $= \sqrt{{(- 1)}^{2} + 2^{2}} = \sqrt{5}$ $= sqrt((-1)^2 + 2^2) = sqrt5$

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How do you find $| - 1 + 2 i |$ $abs( -1 + 2i )$ ?

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Science

Math

Humanities

... and beyond

How do you find |−1+2i|abs( -1 + 2i )?

1 Answer

Explanation:

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Impact of this question

How do you find $| - 1 + 2 i |$ $abs( -1 + 2i )$ ?