The work of a student to solve the equation 3(3x − 4) = 8 + 2x + 5 is shown below: Step 1. 3(3x − 4) = 8 + 2x + 5 Step 2. 6x − 7

Question

3 years ago

10

The work of a student to solve the equation 3(3x − 4) = 8 + 2x + 5 is shown below: Step 1. 3(3x − 4) = 8 + 2x + 5 Step 2. 6x − 7

= 13 + 2x Step 3. 6x − 2x = 13 + 7 Step 4. 4x = 20 Step 5. x = 5 In which step did the student first make an error and what is the correct step? Step 2, 9x − 12 = 13 + 2x Step 2, 9x − 4 = 2(6 + x + 3) Step 3, 6x + 2x = 13 + 7 Step 3, 6x − 2x = 13 − 7

Mathematics

2 answers:

Nutka1998 [239] · Answer 1 · 2022-04-23T16:39:12+03:00

Nutka1998 [239]3 years ago

5 0

Welll 12 is the power of 12 so the sum of 32 is 12

Sauron [17] · Answer 2 · 2022-04-23T18:01:16+03:00

Sauron [17]3 years ago

4 0

Student made an error in step 2. Correct step is 9x - 12 = 13 + 2x.