Word problem on quadratic unit review! TEST TODAY

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This is the word problem , how do I do it?

A rectangle has a length 6 more than its width.  If the width is decreased by 2 and the length decreased by 4, the resulting rectangle has an area of 21 square units.  What is the length of the original rectangle?  What is the ratio of the original rectangle's area to the new rectangle's area?  what is the perimeter of the new rectangle?  Show all your work.

Can someone please show me how you did this?  I'm lost.

Jun 12th, 2015

Thank you for the opportunity to help you with your question!

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Let the width of the original rectangle be x

Length of the original rectangle is 6 more than its width.

So, length of the original rectangle = x + 6


Width is decreased by 2 and the length decreased by 4.

Width of the new rectangle = x - 2

Length of the new rectangle = x + 6 - 4 = x + 2

Area of the new rectangle = length * width= (x + 2)(x - 2) = 

But, it is given that area of new rectangle = 21 square units


Therefore,



So, width of the original rectangle = x = 5 units

Length of the original rectangle = x + 6 = 5 + 6 = 11 units

Area of the original rectangle = length * width = 11 * 5 = 55 square units




Length of new rectangle = x + 2 = 5 + 2 = 7

Width of new rectangle = x - 2 = 5 - 2 = 3

Perimeter of new rectangle = 2(length + width) = 2(7 + 3) = 2*10 = 20 units

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Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 12th, 2015

Thanks :) rating a good one buddy

Jun 12th, 2015

:)

Jun 12th, 2015

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