x^2+2x^2-9x-18=0 помогите плиз

x² + 2x² - 9x - 18 = 03x² - 9x - 18 = 0x² - 3x - 6 = 0D = 9 + 24 = 33x1 = (3 - √33)/2x2 = (3 + √33)/2