TimothyB1 TimothyB1

17-08-2017
Mathematics

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A student says that the perimeter of a rectangle 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

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texaschic101 texaschic101

17-08-2017

P = 2L + 2W
P = 2(2x - 1) + 2(3x) = 4x - 2 + 6x = 10x - 2

the student distributed wrong.....2(2x - 1) = 4x - 2....added to 6x = 10x - 2, not 10x - 1

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