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The problem you've given is a quadratic equation with the mathematical sentence  x^{2} +19x-8=0.
Let x be the measure of the border in the entire garden.
Before putting the border:
After putting the border: (Add x)
A= 92m^{2}
Since the formula of getting the area of the rectangle is A=LW, we have,
Multiplying it will give you:84+19x+ x^{2} =92
Then, apply Subtraction Property of Equality, subtract 92 to both sides of the equation, and it will give you the result of  x^{2} +19x-8=0, which is a quadratic equation.
0 0 0
How did you get it?. Sorry i'm not good in math. ✌
Omygash. Thank you thank you so muchhhhh. ..
Youre Welcome...
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