Question 18
Algebraic ExpressionsSimplify (324 − 4x2)/(2x + 18)
- A.2(x − 9)
- B.2(9 + x)
- C.81 − x2
- D.−2(x − 9)
Show the answer and explanation
Answer: D (−2(x − 9))
Explanation
324 − 4x² = (18 − 2x)(18 + 2x). Cancelling 2x + 18 leaves 18 − 2x = −2(x − 9).