Question

The work of a student trying to solve the equation 3(4x – 2) = 9 + 2x + 5 is shown below:

Step 1: 3(4x – 2) = 9 + 2x + 5

Step 2: 12x – 2 = 14 + 2x

Step 3: 12x – 2x = 14 + 2

Step 4: 10x = 16

Step 5: x = 1.6

In which step did the student first make an error and what is the correct step? (4 points)


Step 2: 12x – 2 = 4 + 2x
Step 3: 12x – 2x = 14 – 2
Step 3: 12x + 2x = 14 + 2
Step 2: 12x – 6 = 14 + 2x

Answer 1

@iGreen @.Sam.

Answer 2

3(4x – 2) = 9 + 2x + 5

First step is to distribute 3 into the parenthesis.

3(4x - 2)

Can you do that?

Answer 3

3x4= 12x 3x2=6

Answer 4

That's actually 3 * -2

Answer 5

oh lol sorry

Answer 6

Um, 3 x -2 isn't -1

Answer 7

1! sorry!!!!

Answer 8

No, you're subtracting 3 - 2, we're MULTIPLYING 3 x -2

Answer 9

OMG MY BRAIN IS FRIED OMG LOL

Answer 10

xD

It's fine

Answer 11

-6!!!

Answer 12

Yep, and they put 12x - 2, when it's supposed to be 12x - 6.

Answer 13

So which one should be your answer?

Answer 14

OH I GET IT!!!!! IT WOULD BE D

Answer 15

Yep!

Answer 16

CAN YOU HLP WITH ANOTHER 2!?

Answer 17

Sure, just close this one and oepn a new one.

Answer 18

*open