(5xy – 2yz – 2zx + 10xyz) – (3xy + 5yz – 7zx)
= 5xy – 2yz – 2zx + 10xyz – 3xy – 5yz + 7zx
=5xy – 3xy – 2yz – 5yz – 2zx + 7zx + 10xyz
= 2xy – 7yz + 5zx + 10xyz
First monomial → Second monomial ↓ | 2x | –5y | 3x2 | – 4xy | 7x 2 y | –9x 2 y 2 |
2x | 4x2 | . . . | . . . | . . . | . . . | . . . |
–5y | . . . | . . . | -15x2y | . . . | . . . | . . . |
3x2 | . . . | . . . | . . . | . . . | . . . | . . . |
– 4xy | . . . | . . . | . . . | . . . | . . . | . . . |
7x 2 y | . . . | . . . | . . . | . . . | . . . | . . . |
–9x2 y2 | . . . | . . . | . . . | . . . | . . . | . . . |