Answer:
4n² - 6
Explanation:
Perimeter of the triangle is sum of all sides.
Perimeter = -6n² - 2
-8n² +2 -2n² + 2 + third side = -6n² - 2
Combine the like terms in the LHS,
-8n² - 2n² + 2 + 2 +third side = -6n² - 2
-10n² + 4 + third side = -6n² - 2
We can find the third side by subtracting the sum of other two sides from the perimeter.
third side = -6n²- 2 + 10n² - 4
= -6n² + 10n² -2 - 4
= 4n² - 6