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# Completing the square watch

1. How do you work on a completing the square in c1 when there is a surd at the end of finding x or y
2. (Original post by Fred Bosire)
How do you work on a completing the square in c1 when there is a surd at the end of finding x or y
please post a photo of a question
3. (Original post by Fred Bosire)
How do you work on a completing the square in c1 when there is a surd at the end of finding x or y
Give us an example of a question.
4. (Original post by Fred Bosire)
How do you work on a completing the square in c1 when there is a surd at the end of finding x or y
In C1 if you get surds in your results they should be stated as simplified exact surd solutions

x^2-6x-4=0
Complete the square
(x-3)^2 -13 =0
Add 13 to both sides
(x-3)^2 = 13
Square root both sides
x-3= + or - root(13)
Add 3 to both sides
x=3 + root(13) or 3 - root(13)

If you have to sketch the curve then it crosses the x axis at the two solutions above
you should see that root(13) is bigger than 3 so that 3-root(13) is on the negative side of the x axis
You should state the coordinates of the crossing points and/or mark the axis with the exact surd solutions.

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5. Thank you gunner 42.... That cleared things up for me

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