Question

Помогите 5x^2-11x+2 по формуле 1

Answer 1

$5x^2-11x+2=0 \ D=b^2-4ac=(-11)^2-4*5*2=121-40=81 \ x_1_,_2= frac{-b^+_- sqrt{D} }{2a} \ \ x_1= frac{-(-11)+ sqrt{81} }{2*5}= frac{11+9}{10}= frac{20}{10}=2 \ \ x_2= frac{-(-11)- sqrt{81} }{2*5}= frac{11-9}{10}= frac{2}{10}=0,2$