I'm dealing with an issue dividing polynomials, I have:
Determine the value of $a$ to make: $x^2 + 2x - a$ divisible by $x + 4$
I don't know even where to start, this $a$ confuses me a lot;
Thanks in advance;
But I'm still confused, I'm trying to divide it in the longer way, I've multiplied with an $x$ coefficient and got a rest of $-2x - a$ but I'm unable to find the other part of the coefficient to cancel that $-2x$ and got the $a$.