Perform the indicated operations .
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1. 8y2+6y-2
+ 3y2-8y+2
----------------------------
= 11y2-2y
2. 6a2+10ab-20b2
+ 14a2-24ab+4b2
---------------------------------
20a2-14ab-16b2
3. 8x2+24xy-16y2
- 22x2-16xy-22y2
-------------------------------
-14x2+8xy-38y2
4. 5c+7+9c2
- 16c+20+6c2
-----------------------------
-11c+27+15c2
5. 5x2 -4
+ 3x2+8x+4
-4x2-7x
---------------------------
4x2+x