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Answer:
(2x + 7) feet
Step-by-step explanation:
I'm guessing the expression there is
4x² + 28x + 49
4x² +14x +14x +49
Factorize
2x ( 2x + 7) +7( 2x + 7)
(2x + 7)²
Area = (side)1
One side is (2x +7)