annielolok annielolok

13-01-2017
Mathematics

contestada

The work of a student to solve the equation
2(3x − 4) = 8 + 2x + 4 is shown below:
Step 1: 2(3x − 4) = 8 + 2x + 4
Step 2: 5x − 6 = 12 + 2x
Step 3: 5x − 2x = 12 + 6
Step 4: 3x = 18
Step 5: x = 6

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

Respuesta :

Sophlope Sophlope

13-01-2017

step two he said 2(3x-4) is 5x-6 when he added when he should have used multiplication to solve this part making the correct step 6x-8

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