- #1

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## Homework Statement

One root of the equation x^2 + ax + b = 0 is 4 + 5i.

Write down the second root.

## Homework Equations

N/a?

## The Attempt at a Solution

My problem is it's a "write down" question which suggests no working required. This is probably so simple but I just don't know... I cannot do this even thought I know the later parts of the question. Thank you in advance ;)