< = square root sign
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first step - expand...
x2 - 6x + 9 -3 = 0
x2 -6x + 6 = 0
use the formula x = -b (+)<b2 - 4ac
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2a
and.. x = -b (-)<b2 - 4ac
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2a
simplify...
6 +<(36-24)
------------ = 6 +<12
2 -------
2
=> 3 + (<12/2)
and 3 - (<12/2)
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<12 represents the answer in surd form...
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<12/2 can be written as (<3*4)/2 = (<3 * <4)/2 = (<3 *2)/2 = <3
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so the final answer is 3(+/-) <3