У=-3х^2+12х-9 помогите

Question

У=-3х^2+12х-9 помогите

Answer 1

-3x^2+12x-9=0

D=b^2-4ac= 144 - 4*27= 6^2

x1= -b+√D/2a= -12+6/-6= -1

x2= -b-√D/2a= -12-6/-6= 3