Find the value of x so that f (x) = - 9 if f (x) = 3x+4

f (-9) = - 23

Step-by-step explanation:

Step 1: Identify the function

f (x) = 3x + 4

Step 2: Set x to - 9 in the function

f (-9) = 3 (-9) + 4

Step 3: Multiply

f (-9) = - 27 + 4

Step 4: Add

f (-9) = - 23

Answer: f (-9) = - 23