To find and simplify the expression representing the perimeter of the triangle, we first need to identify the lengths of each of the sides.
The triangle has: Two sides of length \(4x - 17\) and one side of length \(3x + 9\).
Step 1: Write the expression for the perimeter
The perimeter \(P\) of a triangle is the sum of the lengths of all its sides. Therefore, we can express the perimeter as:
\[ P = \text{side 1} + \text{side 2} + \text{side 3} \]
Substituting the lengths of the sides into the formula, we get:
\[ P = (4x - 17) + (4x - 17) + (3x + 9) \]
Step 2: Combine like terms
Now we can combine the like terms in the expression:
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First, combine the coefficients of \(x\):
\[ 4x + 4x + 3x = 11x \]
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Next, combine the constant terms:
\[ -17 - 17 + 9 = -34 + 9 = -25 \]
Putting it all together, we have:
\[ P = 11x - 25 \]
Conclusion
Thus, the simplified expression for the perimeter of the triangle is:
\[ \boxed{11x - 25} \]