To factor an algebraic expression means to break it up into expressions that can be multiplied together to get the original expression. To factor a polynomial by GCF, all we
So if we were to factor this, this would be equal to x plus 5, times x plus 10. And multiply it out. I encourage you to multiply this out, and see that this is indeed x squared plus 15x, plus 10. In fact, let's do it. x