help_people
  • help_people
Can you check if this is right?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
help_people
  • help_people
The lengths of two sides of a triangle are shown below: 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? 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.
help_people
  • help_people
Part A: To get the total length of the two sides you ahem to add them together: 3x^2 - 4x -1 -x^2+4x+5 -------------- 2x^2+4 Part B: To find the length of the third side of the triangle you will add the perimeter and the total length of the two sides together: 5x^3 - 2x^2 + 3x -8 -(2x^2 +4) ---------------------- 5x^3 - 4x^2 + 3x -12
help_people
  • help_people
idk what they're asking for in pt c?

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More answers

hartnn
  • hartnn
perimeter = side 1 + side 2 + side 3 so side 3 = perimeter - (side 1 + side 2)
hartnn
  • hartnn
lets first correct the answer of part B :)
hartnn
  • hartnn
To find the length of the third side of the triangle you will subtract the total length of the two sides from the perimeter
help_people
  • help_people
woat so part b is wrong?
hartnn
  • hartnn
yes, part B is wrong.
help_people
  • help_people
@hartnn
help_people
  • help_people
ok
hartnn
  • hartnn
the words in part B are incorrect, the answer is correct, because you indeed subtracted the answer from part A. just replace the description in your part B. ------ Part B: To find the length of the third side of the triangle you will subtract the total length of the two sides from the perimeter. 5x^3 - 2x^2 + 3x -8 -(2x^2 +4) ---------------------- 5x^3 - 4x^2 + 3x -12
help_people
  • help_people
ok
hartnn
  • hartnn
Part C: Polynomials are closed under addition if you get a polynomial by adding polynomials. Did you get a polynomial answer for part A? Polynomials are closed under subtraction if you get a polynomial by subtracting polynomials. Did you get a polynomial answer for part B?
help_people
  • help_people
yes and yes right?
hartnn
  • hartnn
good! since we get a polynomial after adding and subtracting polynomials, we can conclude, that the polynomials are closed under addition and subtraction.
help_people
  • help_people
thank you! may you check 2 more?
help_people
  • help_people
@hartnn ??

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