The lengths of two sides of a triangle are shown below
Side 1: 5x²+2x-3
Side 2: 8x-3x²+2

The perimeter of the triangle is 2x³-5x²+4x-8

Part A: what is the total length of the two sides, 1 and 2, of the triangle?

Part B what is the length of the third side of the triangle?

Part C : Do the answers for part A and part B show that the polynomials are closed under addition and subtraction? Justify your answer.

Question

The lengths of two sides of a triangle are shown below 
Side 1: 5x²+2x-3
Side 2: 8x-3x²+2

The perimeter of the triangle is 2x³-5x²+4x-8 

Part A: what is the total length of the two sides, 1 and 2, of the triangle?

Part B what is the length of the third side of the triangle?

Part C : Do the answers for part A and part B show that the polynomials are closed under addition and subtraction? Justify your answer.

welshfella · Answer

5x²+2x-3 +  8x-3x²+2


add like terms

welshfella · Answer

can you do that?

anonymous · Answer

No I don't understand !

anonymous · Answer

Yes I Did It I Got 2x²+10x-1 @welshfella