Question

Will give medal!!


Step 1:3(2x - 4) = 8 + 2x + 6
Step 2:5x - 7 = 14 + 2
Step 3:5x = 2x = 14 + 7
Step 4:3x = 21
Step 5: x = 7

In which step did the student first make an error and what is the correct step?

A) Step 2; 6x - 12 = 14 + 2x
B) Step 2; 6x - 7 = 2(6 + x + 4)
C) Step 3; 5x - 2x = 14 - 7
D) Step 3; 5x + 2x = 14 + 7

Answer 1

and you assessment of it is?

Answer 2

C? @amistre64

Answer 3

write down step 1 .. can you obtain step 2 from it?

Answer 4

is step 3 a typo? its got 3 equals signs .. but thats not the first error i see

Answer 5

***2 equals signs

Answer 6

Oh my my gosh you're right I'm sorry!

Step 1: 3(2x - 4) = 8 + 2x + 6
Step 2: 5x - 7 = 14 + 2x
Step 3: 5x - 2x = 12 + 7
Step 4: 3x = 21
Step 5: x = 7

@amistre64

Answer 7

still 2 errors

Answer 8

3(2x - 4) = 8 + 2x + 6

now, what would YOU do to process it

Answer 9

whats your step 2 look like?

Answer 10

14 became 12 for some reason
from step 2 trwp 3

Answer 11

3(2x) 3(-4) = 8 + 2x + 6

6 -12 = 8 + 2x + 6 ?

@americansniper12

Answer 12

6x-12 on the left, and the right adds to 14+2x

is this what they have in their 2nd step?

Answer 13

Yes @amistre64

Answer 14

this is really just matching what you have to what they have at this point ..

they have:
5x - 7 = 14 + 2x

you have:
6x - 12 = 14 + 2x

and your assessment you beleive these are alike?

Answer 15

A) Step 2; 6x - 12 = 14 + 2x
B) Step 2; 6x - 7 = 2(6 + x + 4)

lets assume you see a difference, and we are to correct it ... what is the correct step 2?

Answer 16

There were not parentheses? @amister64