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The area of a square is numerically 21 more than the perimeter find the lenght of the side?
Wiki User
∙ 13y ago
Let the length be x:
x2 = 4x+21
x2-4x-21 = 0
Solving the above quadratic equation works out as:
x = -3 or x = 7 it must be the latter because the length can't be negative.
Therefore: length = 7 units
Check: 72 = 28+21
Wiki User
∙ 13y ago
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A square with an area of 400 square units has a perimeter of 80 units.
The larger the perimeter of a square the larger the area of that square?
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