please anwer in a photo please this is my request
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Explanation:
Just factorise the given equation for the required side.
9z2 - 6z +1
9z2 - 3z -3z +1
3z(3z-1) -1(3z-1)
(3z-1) (3z-1)
Hence, z= 1/3
Side of square=1/3
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