Решите задачу:
X^2+9x^2-4x-11x-45+35=0 10x^2-15x-10=0 д=15^2-4*10*(-10)=225+400=625=25^2 x1= (15+25)/20=35/20=7/4 x2= (15-25)/20 = -10/20=-1/2