Question

what is a real root?

Answer 1

If you take the square root of a negative number, you get an "imaginary" number. If you find where a function equals zero and if those zeros lay on the x-axis, then the roots of the function or real. Otherwise, the roots are "imaginary."

For example, \(x^2=-1\implies x=\sqrt{-1}\). This is not a real root.
On the other hand, \(x^2=4\implies x=\sqrt{4}=2\). This lays on the x-axis; hence, is a real number.

Doe this make sense?

Answer 2

Yeah thanks a lot you saved my life.

Answer 3

You're welcome

Answer 4

In mathematics, a zero, also sometimes called a root, of a real-, complex- or generally vector-valued function f is a member x of the domain of f such that f(x) vanishes at x; that is, In other words, a "zero" of a function is an input value that produces an output of zero (0).