Incomplete quadratic equations and how to solve them
Answers are for parents and teachers.
1
Solve 2x² - 18 = 0.
x = ±3
2
Solve 9x² + 4 = 0.
no real root
3
Solve 7x² - 14x = 0.
x₁ = 0, x₂ = 2
4
Solve x² - 20 = 0.
x = ±2√5
5
Solve 3x² + 5x = 0.
x₁ = 0, x₂ = -5/3