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## Homework Statement

The expression

**x^2 - 2mx**has a minimum value as

**x**varies

qu) Find the minimum value of

**x^2 - 2mx**

Give your answer in terms of

**m**

## Homework Equations

## The Attempt at a Solution

I have no idea, how to approach this. I have tried reasoning logically how it might work, but came nowhere as I dunno how the expression can have a minimum value :S is the power of 2 a clue? A few of us (in my class) have tried but no-one has the fainted idea. hope you can help

thnx