Is a circle a function

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9