Given ƒ(x) = 3x + 9, find x when ƒ(x) = 21.
A) 3
B) 4
C) 7
D) 10
2 answers:
X=21
21-9=12
3x=12
12divided by 3=4
X=4. The answer is B
Answer:
B
Step-by-step explanation:
Replacing <em>f</em>(x) with 21, this is the equation
21=3x+9
First, subtract 9 from each side of the equation to get:
12 = 3x
Next, divide each side by 3 to get:
4 = x
So the answer is B.
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