Answer:
15x - 5units
Step-by-step explanation:
Perimeter of a triangle = addition of all sides of the triangle.
A triangle is a polygon with 3 sides.
Therefore if the sides of the triangle are 2x - 1) units, (8x-4) units, and 5x units
Perimeter = 2x - 1 + 8x -4 + 5x
Collect like terms
Perimeter = 2x + 8x + 5x -1 - 4
Perimeter = 15x - 5units
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