Подробное решение
2(5x-1)^2+35x-11=0
50x^2+15x-9=0
D=15^2-4*50*(-9)=225+1800=2025
x1=(45-15)/(2*50)=30/100=0.3 x2=(-45-15)/(2*50)=-60/100=-0.6