find the zero of p(x)=xsquare-6x+9
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p(x)=x^2-6x+9. 9= -3*-3
=x^2-3x-3x+9 6=-3-3
=x(x-3)-3(x-3)
=(x-3) (x-3)
x=3 or x=3
Hope it will help you
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