Question

3xy+5yz-7zx from 5xy-2yz-2zx+10xyz

Answer 1

5xy-2yz-2zx+10xyz-(3xy+5yz-7zx)
=5xy-2yz-2zx+10xyz-3xy-5yz+7zx
=2xy-7yz+5zx+10xyz

Answer 2

$(5xy – 2yz – 2zx + 10xyz) – (3xy + 5yz – 7zx) \\ </p><p>= 5xy – 2yz – 2zx + 10xyz – 3xy – 5yz + 7zx \\ </p><p>=5xy – 3xy – 2yz – 5yz – 2zx + 7zx + 10xyz \\ </p><p>= 2xy – 7yz + 5zx + 10xyz</p><p>$