Question

Error analysis

Answer 1

2(2x-1) + 2(3x)=4x-2+6x = 10x - 2 & not =10x-1

Answer 2

One side (l) = 2x-1
other side (w) = 3x

perimiter = all of the sides added together

perimiter = 2l + 2w

perimiter = 2(2x-1) + 2(3x)

2(2x) - 2(1) + 2(3x) = 4x - 2 + 6x

perimiter = 10x - 2

The previous statement is incorrect because the student did not distribute the 2 onto the -1.