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Lubov Fominskaja [6]
3 years ago
14

What is the answer to this problem? x + (3x -2) = 18

Mathematics
2 answers:
sladkih [1.3K]3 years ago
5 0
X is 5! I think hope it’s right!
Schach [20]3 years ago
3 0

Answer: 5

Step-by-step explanation:

x+3x−2=18

x+3x+−2=18

(x+3x)+(−2)=18(Combine Like Terms)

4x+−2=18

4x−2=18

Step 2: Add 2 to both sides.

4x−2+2=18+2

4x=20

Step 3: Divide both sides by 4.  

x=5

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vampirchik [111]

Answer:

In this problem, we are given the following functions:

f(x)=\frac{1}{2}x

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f^{-1}(x)=2x

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f(2)=\frac{1}{2}\cdot 2 = 1

Then we want to calculate f^{-1}(1). We can do it by substituting

x = 1

into f^{-1}(x). Doing so,

f^{-1}(1)=2\cdot 1 = 2

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Then we want to calculate f^{-1}(-2), which can be calculated by plugging

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into f(x), we find

f(-4)=\frac{1}{2}\cdot (-4)=-2

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We know already that

f^{-1}(-2)=-4

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