Nature of roots of quadratic equations: The discriminant

Lessons

1. Positive Discriminant
   Without solving or graphing, determine the nature of the roots of the quadratic equation: $2x^2-12x+10=0$
2. Zero Discriminant
   Without solving or graphing, determine the nature of the roots of the quadratic equation: $x^2+4=4x$
3. Negative Discriminant
   Without solving or graphing, determine the nature of the roots of the quadratic equation: $x^2+x+1=0$