Add:

9ax, + 3by – cz, -5by + ax + 3cz

State whether the statements are true (T) or false (F).

The value of (a+1) (a-1) (a²+1) is a⁴-1

Add:

7a²bc, -3abc², 3a²bc, 2abc²

Add:

xy²z² + 3x²y²z–4x²yz²,-9x²y²z + 3xy²z² + x²yz²

Add:

5x² – 3xy + 4y² – 9, 7y² + 5xy – 2x² + 13