Question 6
Algebraic ExpressionsIf f(x + 2) = 6x2 + 5x − 8, find f(5).
- A.54
- B.15
- C.−8
- D.61
Show the answer and explanation
Answer: D (61)
Explanation
f(5) means x + 2 = 5, so x = 3: 6(9) + 5(3) − 8 = 54 + 15 − 8 = 61.
If f(x + 2) = 6x2 + 5x − 8, find f(5).
Answer: D (61)
f(5) means x + 2 = 5, so x = 3: 6(9) + 5(3) − 8 = 54 + 15 − 8 = 61.