The factor of the polynomial expression is "(x+2)".
Polynomial expression:
[tex]\to x^3+2x^2-9x-18[/tex]
factor=?
[tex]\to x^3+2x^2-9x-18=0\\\\\to x^2(x+2)-9(x-2)=0\\\\\to (x+2)(x^2-9)=0\\\\\to (x+2)(x^2-3^2)=0\\\\\to (x+2)(x-3)(x+3)=0\\\\[/tex]
Therefore, the answer is "[tex](x+2)[/tex]".
Learn more about the factor here:
brainly.com/question/713325
