Math help please check

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Add or Subtract for #3-4

3. (2x2 + 6x + 1) + (–7x2 + 2x – 3)

5x2 – 4x – 2
–5x2 + 8x – 2
5x2 – 8x + 2
–9x2 – 8x + 2

4. (3x2 – 7x – 4) – (6x2 – 6x + 1)

–3x2 – x –5
–3x2 –13x + 5
9x2 – x + 5
3x2 – 13x – 5

My answers:
3. 5x2 – 8x + 2
4. –3x2 – x –5

  • Math help please check -

    #4 is correct, but #3 is not

    #3.
    (2x2 + 6x + 1) + (–7x2 + 2x – 3)
    = 2x^2 + 6x + 1 - 7x^2 + 2x - 3 , the brackets were not needed because a +1 was understood in front of them
    = -5x^2 + 8x -2

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