The equation is given as,
[tex]x^2+5x-24\text{ }[/tex]Factorizing the given expression,
[tex]\begin{gathered} x^2+5x-24=x^2+8x-3x-24\text{ } \\ x^2+5x-24=x(x+8)-3(x+8) \\ x^2+5x-24=(x-3)(x+8) \end{gathered}[/tex]Therefore the factors of the given expression are
[tex](x-3)(x+8)[/tex]Thus one of the dimensions could be
[tex](x+8)[/tex]