Question

How do you factor `x^2-4x+45`?

Answer 1

It cannot be factored because
the term `sqrt(b^2-4ac)` is negative.

Explanation:

`x^2−4x+45`

It cannot be factored because
the term `sqrt(b^2-4ac) = sqrt ((-4)^2-(4 xx 1 xx 45)) = sqrt (16-180)`
We cannot find square root for `-164`.