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error analysis
a student says that the perimeter of a rectangle with side lengths (2x-1)inches and 3x inches can be written as (10x-1) inches. because 2(2x-1) + 2(3x)=10x-1. explain why this statement is incorrect.

Sagot :

here2help
2(2x-1) + 2(3x)=4x-2+6x = 10x - 2 & not =10x-1
nashty
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.

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