Question

A student was asked to simplify the expression 2(x+3)+(4x−8)−7x.

Identify the line which contains the initial error.
1: 2(x+3)+(4x−8)−7x
2: 2x+6+4x+8−7x
3: (2x+4x−7x)+(6+8)
4: −x+14

Answer 1

4

Explanation:

1. 2{x+3}+{4x_8}_7x is same
2. 2x+6+4x+8_7x the first bracket was multiply by 2
3. {2x+4x_7x}+{6+8} the like term was collected and grouped with brackets

Answer 2

Line 2

Explanation:

When factoring the second bracket, 1 x -8 is -8.