Answer:
[tex]D.\:\left(x-3\right)\left(x+6\right)[/tex]
Step-by-step explanation:
[tex]x^2 + 3x - 18[/tex]
[tex]\left(x^2-3x\right)+\left(6x-18\right)[/tex]
[tex]\left(x^2-3x\right):x\left(x-3\right)[/tex]
[tex]\left(6x-18\right):6\left(x-3\right)[/tex]
[tex]x\left(x-3\right)+6\left(x-3\right)[/tex]
Factor, common term:- x-3
[tex]\left(x-3\right)\left(x+6\right)[/tex]
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