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Dictionary: Zero / Root
A zero (or root) is where the graph of a function crosses the x-axis — where f(x) = 0.
f(x) = 0
To find zeros we set f(x) = 0 and solve for x. A linear function has one zero, a quadratic can have 0, 1 or 2.
Example: f(x) = x - 3 has a zero at x = 3, since f(3) = 0.
Without mathematics, there is nothing you can do.
— Shakuntala Devi (1929–2013)