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Effectus [21]
4 years ago
9

Given ƒ(x) = 9x + 54, find x when ƒ(x) = 18. A)−6 B)−4 C)3 D)8

Mathematics
2 answers:
Katen [24]4 years ago
7 0

Answer:

B. -4

Step-by-step explanation:

We want to find x such that f(x)=18.

We need to therefore solve 9x+54=18 forx.

9x+54=18

Divide both sides by 9:

(9x+54)/9=18/9

9x/9+54/9=18/9

Simplify:

x+6=2

Subtract 6 on both sides:

x=2-6

Simplify

x=-4.

So f(-4) should have value 18.

Let's check.

f(x)=9x+54

f(-4)=9(-4)+54

f(-4)=-36+54

f(-4)=18

So the answer is B.

Serga [27]4 years ago
3 0

Answer:

The value of x when  f(x)=18 is -4

Step-by-step explanation:

Expression : f(x)=9x+54

We are given that f(x)=18

We are supposed to find the value of x when  f(x)=18

So, Expression : f(x)=9x+54

Substitute  f(x)=18

18=9x+54

18-54=9x

-36=9x

\frac{-36}{9}=x

-4=x

So, option B is true

Hence the value of x when  f(x)=18 is -4

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