SOLUTION: Ok, the problem below I just can't figure out! Can you please help me? can you show me how to get the answer? The area of a rectangle is 80 square feet and its length is 1 foot m

Question 191065: Ok, the problem below I just can't figure out! Can you please help me? can you show me how to get the answer?
The area of a rectangle is 80 square feet and its length is 1 foot more than its width. Find its width.
Thank you for your time!
G.E.P
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Ok, the problem below I just can't figure out! Can you please help me? can you show me how to get the answer?
The area of a rectangle is 80 square feet and its length is 1 foot more than its width. Find its width.
-----------
Area = l*w
A = w*(w+1) = 80

Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=321 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 8.45823643358446, -9.45823643358446. Here's your graph:

Use the positive value.
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