posted by Mary .
When factoring an equation, how do I know if the result is prime? For example, I have a problem x^2 - 2x + 4 and I think it is prime because I can't solve it. Am I right?
If an expression cannot be factored over the rational numbers, it is often considered "prime"
since x^2 - 2x + 4 cannot be factored with rational factors, you are correct.