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maths again!!!

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spiderman:
Hey thanks guys!!!!!

spiderman:
please can anyone help me with this sum

(x-3)^2 -3=0
Solve this quadratic function leaving surds in your answer.....

Ghost Of Highbury:
< = square root sign
------------------------------
first step - expand...

x2 - 6x + 9 -3 = 0

x2 -6x + 6 = 0

use the formula x = -b (+)<b2 - 4ac
                           -----------------------------      
                                            2a

and..                   x = -b (-)<b2 - 4ac
                           -----------------------------
                                            2a

simplify...

6 +<(36-24)
------------ = 6 +<12
        2          -------
                         2

=> 3 + (<12/2)

and 3 - (<12/2)

------------------

<12 represents the answer in surd form...
------
<12/2 can be written as (<3*4)/2 = (<3 * <4)/2 = (<3 *2)/2 = <3

-----

so the final answer is 3(+/-) <3

Ghost Of Highbury:
find a ppt attached...it has the surd form thingy...

spiderman:
but the answer in the text is 3+-square root of 3....

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