# [SOLVED] Completing the Square

• January 10th 2010, 02:46 PM
beeohbee27
[SOLVED] Completing the Square
I've got some exercises for completing the square but the way I've been shown to work it out doesn't work because halfing the three causes problems. Can anybody help me with these exercises?

$x^2 - 3x + 7$

$x^2 - 3x + 4$

Thanks
• January 10th 2010, 02:51 PM
pickslides
Quote:

Originally Posted by beeohbee27
I've been shown to work it out doesn't work because halfing the three causes problems.

$x^2 - 3x + 7$

Leave halving 3 as a fraction

$x^2 - 3x \left(+\frac{9}{4}\right)+ 7\left(-\frac{9}{4}\right)$

$\left(x - \frac{3}{2}\right)^2 +\frac{19}{4}$
• January 10th 2010, 04:24 PM
beeohbee27
Simple as that. I was thinking there may be some kind of way to get an answer in integers but I can see that this is the way to do it now.