Question 1094110
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Your equation from the condition is


(x+5)*(x+4) = x^2 + 101  ====>

x^2 + 9x + 20 = x^2 + 101  ====>

9x = 101-20 = 81  ====>  x = {{{81/9}}} = 9.


<U>Answer</U>.  9 cm.
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