Answer:
Explanation:
138 cm² = (x + 2) × ( 2x + 3) x 1/2
138 cm² = x + 2 × 2x + ) x 1/2
138 cm² = x + 4x + x * 0.5
0.5/138 cm² = 6x * 0.5 /0.5
6/69cm² = 6x/6
x = 11.5
This might be wrong so just take the square root of 138.
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