SOLUTION: The area of a rectangle is 21 square meters. What is the length and width of the rectangle if its length is 4 meters greater than its width?

Question 332317: The area of a rectangle is 21 square meters. What is the length and width of the rectangle if its length is 4 meters greater than its width?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
y = x^2 - 2x - 3; find y-intercept and any x-intercepts.
Do I treat as a parabola where I replace x with 0 and solve for y?
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It is a parabola, no matter what anyone does.
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To find the y-intercept, set x = 0
--> (0,-3)
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The x-intercepts are the solutions, the zeroes.

(x-3)*(x+1) = 0
x = -1, 3

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