Question 12
Algebraic ExpressionsWhich of the following is a factor of 15 + 7x − 2x2?
- A.x − 3
- B.x + 3
- C.x − 5
- D.x + 5
Show the answer and explanation
Answer: C (x − 5)
Explanation
15 + 7x − 2x² = −(2x² − 7x − 15) = −(2x + 3)(x − 5), so x − 5 is a factor (x = 5 gives 15 + 35 − 50 = 0).