Math help please check
posted by Delilah .
Add or Subtract for #34
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

#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