Complete the square on:

Complete the square on:
x^2 - 8x
and
x^2 + 4k

Thanks

Quote:

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Originally Posted by icesta1

Complete the square on:
x^2 - 8x
and
x^2 + 4k

Thanks

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You have to add and subtract the square of half of your coefficient of $\displaystyle x$.


So $\displaystyle x^2 - 8x = x^2 - 8x + (-4)^2 - (-4)^2$

$\displaystyle = \left(x - 4\right)^2 - 16$.



$\displaystyle x^2 + 4k$ is already complete as the coefficient of $\displaystyle x$ is $\displaystyle 0$.