Question

Solve.

The area of a square is 21 more than its perimeter. Find the length of a side.
The length of a side of the square is
units.
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Answer 1

s² = 4s + 21

s² - 4s - 21 = 0

(s - 7)(s + 3) = 0

s = 7 (s = -3 will not work)

The length of each side of this square is 7 units.