X^2+2x^2-9x-18=0 помогите плиз

Question

X^2+2x^2-9x-18=0 помогите плиз

Answer 1

X² + 2x² - 9x - 18 = 0

3x² - 9x - 18 = 0

x² - 3x - 6 = 0

D = 9 + 24 = 33

x1 = (3 - √33)/2

x2 = (3 + √33)/2