I need help please its too early for math :/ 85 points "The lengths of two sides of a triangle are shown.

Side 1: 3x2 − 4x − 1

Side 2: 4x − x2 + 5

The perimeter of the triangle is 5x3 − 2x2 + 3x − 8.

Part A: What is the total length of the two sides, 1 and 2, of the triangle? Show your work. (4 points)

Part B: What is the length of the third side of the triangle? Show your work. (4 points)

Part C: Do the answers for Part A and Part B show that the polynomials are closed under addition and subtraction? Justify your answer. (2 points)"

part A) is just asking you to add side 1 + side 2

part B) is asking for the third side, since you are given perimeter (sum of all sides) you just need to subtract side 3 - side 1 - side 2

part C) for a polynomial to be closed under addition, it just means two polynomials add up to produce another polynomial, same thing for subtraction. use your results from parts A and B to see whether the polynomials are closed under addition/subtraction

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

c

step-by-step explanation: