(x-3)2+x(x+9)=............
(x-3)^2+x(x+9)=x^2-6x+9+x^2+9x=2x^2+3x+9
^2- в квадрате.
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(x-3)^2+x(x+9)=x^2-6x+9+x^2+9x=2x^2+3x+9
^2- в квадрате.