[tex]\begin{gathered} x^2-5x-36 \\ \end{gathered}[/tex]
Any quadratic expression can be factored in the form (x - x1)*(x - x2), where x1 and x2 are its zeros.
For this expression, we have x1 = 9 and x2 = -4
Therefore:
[tex]x^2-5x-36=(x-9)\cdot(x+4)[/tex]
Answer: (x+4)
