SAT Practice Exam

« Previous Problem - Cancelling Fractions

Functions

If ƒ(m) = 3m + cm and c = 13, what is ƒ(-8)

---

Answer
With problems like these, we always need to simplify the function by incorporating the c value

Apply the (c) value of 13 and group m constants into one term

ƒ(m) = 3m + 13m
ƒ(m) = (3 + 13)m
ƒ(m) = 16m

Now evaluate ƒ(-8)

ƒ(-8) = 16(-8)
ƒ(-8) = -128