The first step for factoring this expression is to write -11x as a difference.
2x² + 3x - 14x - 21
Factor out x from 2x² + 3x.
x × (2x + 3) - 14x - 21
Now factor out -7 from -7(2x + 3)
x × (2x + 3) - 7(2x + 3)
Finally,, factor out 2x + 3 from the expression.
(2x + 3) × (x - 7)
This means the correct answer to your question is (2x + 3) × (x - 7),, or option A.
Let me know if you have any further questions.
:)