Решение:
(х+3)²-4х(х-3)=х²+6х+9-4х²+12х=-3х²+18x+9=-3(x²-6x-3)
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Решение:
(х+3)²-4х(х-3)=х²+6х+9-4х²+12х=-3х²+18x+9=-3(x²-6x-3)