3х2-12х+9=0
5х2+25х=0

3x² - 12x + 9 = 0x² - 4x + 3 = 0(x-3)(x-1) = 0x1 = 1x2 = 35x² + 25x = 0x² + 5x = 0x(x+5) = 0x1 = -5x2 = 0