Question

find the sum of 7xy + 5yz - 3zx and 4yz + 9zx - 4xy​

Answer 1

Answer:

=(7xy+5yz−3zx)+(4yz+9zx−4y)+(−3xz+5x−2y)

=7xy+5yz−3zx+4yz+4zx−4y−3xz+5x−2y

=7xy+9yz+3zx+5x−6y

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Step-by-step explanation:

Answer 2

Answer:

7xy+5yz-3zx+4yz+9zx-4xy

7xy+4xy+5yz+4yz+9zx-3zx

11xy+9yz+6zx

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