When is an equation factorable?

Answer 1

We say that an equation is factorizable if it has a factor rather than 1. For instance:

x² + x = x(x + 1)

Another example:

x² + 2x + 1

= x² + x + x + 1

= x(x + 1) + 1(x + 1)

= (x + 1)²