The quadratic equation and its roots
Answers are for parents and teachers.
1
Solve x² + x - 6 = 0.
x₁ = -3, x₂ = 2
2
Solve x² = 121.
x = ±11
3
Find a, b, c and the roots of 4x² - 9 = 0.
a = 4, b = 0, c = -9; x = ±3/2
4
Solve x(x - 5) = 0.
x₁ = 0, x₂ = 5
5
Why does x² = -9 have no real root?
Because the square of any real number is not negative.