Question

The work of a student trying to solve the equation 4(2x − 1) = 11 + 3x + 5 is shown below:

Step 1: 4(2x − 1) = 11 + 3x + 5
Step 2: 8x − 4 = 16 + 3x
Step 3: 8x + 3x = 16 − 4
Step 4: 11x = 24
Step 5: x = 2.18

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

Step 2: 8x − 1 = 16 + 3x

Step 2: 8x − 8 = 6 + 3x

Step 3: 8x − 3x = 16 + 4

Step 3: 8x + 3x = 16 − 8

Answer 1

Take a closer look at Step 3... What do you think? ^.~

Answer 2

I think that 8x + 3x = 16 − 4 should be 8x − 3x = 16 + 4 ??

Answer 3

CORRECT! xD

Answer 4

Cewl Thanks again Nina

Answer 5

^.~ Tha medal?