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= 9x² + 30x + 25 - 12x² + 28x - 49
= 9x² - 12x² + 30x + 28x + 25 - 49
= - 3x² + 58x - 24
9xpngkt2 +30x+25+36xpgkt2+441
9xpngkt2+36pgkt2+30x+25+441
=45pgkt2+30x+466