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Sort each quadratic by its roots.

Exercise and reference answers

Left
Real roots
Items
  1. Item
    x² − 5x + 6 = 0
    Answer
    Real roots
  2. Item
    x² − 4 = 0
    Answer
    Real roots
  3. Item
    2x² + 3x − 5 = 0
    Answer
    Real roots
  4. Item
    x² + x + 1 = 0
    Answer
    Complex roots
  5. Item
    x² + 4 = 0
    Answer
    Complex roots
  6. Item
    x² − 2x + 5 = 0
    Answer
    Complex roots
Right
Complex roots
Instructions
Discriminant b²−4ac > 0 (real) or < 0 (complex)?

Explanation

_Source: syllabus Maths Part I, Ch 5 'Complex Numbers and Quadratic Equations' §5.4_
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