(х-3)^2=x^2-6x+9-9+4=(x-3)^2-5=x^2-6x+9-5=x^2-6x+4
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(х-3)^2=x^2-6x+9-9+4=(x-3)^2-5=x^2-6x+9-5=x^2-6x+4