Find the value of discriminant for each of the following equation.

5m² – m = 0

Which of the following equations is quadratic?

(1) x² + 2x + 11 = 0

(2) x² – 2x + 5 = x²

(3) (x + 2)² = 2x²

Find the value of discriminant for each of the following equation.

2y² – y + 2 = 0

Find the value of discriminant for each of the following equation.

One of the roots of quadratic equation 2x² + kx – 2 = 0 is -2, find k.