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February 27th, 2017, 04:41 PM   #1
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Help with an area problem

Having trouble getting this simple one figured out. Can someone help with number 6?



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February 27th, 2017, 04:54 PM   #2
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Math Focus: Yet to find out.
What have you done so far? Have you drawn a picture?

If $x$ is the length, and $x + 1$ is the width, what can be said about the area? i.e., the relationship between length, width and area of a rectangle.
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February 27th, 2017, 05:01 PM   #3
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Well, I came up with this x(x+1)=72^2 but I can't get worked out from there.


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February 27th, 2017, 05:18 PM   #4
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Almost. It's $72ft^2$, not $72^2$. $ft^2$ is the unit of measurement for area.

Try with x(x + 1) = 72.

Last edited by skipjack; February 28th, 2017 at 07:51 AM.
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February 27th, 2017, 05:18 PM   #5
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No.
x(x + 1) = 72
x^2 + x - 72 = 0
Solve for x.
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February 28th, 2017, 07:56 AM   #6
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Quote:
Originally Posted by scsims View Post
Having trouble getting this simple one figured out. Can someone help with number 6?
45b805255a0ce8db9ce90190b8c1b4b6.jpg
One could use algebra, but it's easier to notice that 9*8 = 8*9 = 72.
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