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Popular >

simplify 5/(1+2i)

Solution

simplify

\frac{5}{1 + 2 i}

Solution

1 - 2 i

Solution steps

\frac{5}{1 + 2 i}

Multiply by the conjugate

\frac{1 - 2 i}{1 - 2 i}

= \frac{5 ( 1 - 2 i )}{( 1 + 2 i ) ( 1 - 2 i )}

Simplify

\frac{5 ( 1 - 2 i )}{( 1 + 2 i ) ( 1 - 2 i )} : \frac{5 - 10 i}{5}

= \frac{5 - 10 i}{5}

Apply the fraction rule:

\frac{a + bi}{c} = \frac{a}{c} + \frac{b}{c} i

= \frac{5}{5} + \frac{- 10}{5} i

Simplify

\frac{5}{5} + \frac{- 10}{5} i : 1 - 2 i

= 1 - 2 i

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Frequently Asked Questions (FAQ)

What is 5/(1+2i) ?
The solution to 5/(1+2i) is 1-2i