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Question

# Find the value of A+B+C if : A=(7xy+5yzâˆ’3zx) B=(4yz+9zxâˆ’4y) C=(âˆ’3xz+5xâˆ’2xy)

A

5xy+3zx+5x4y

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B

5xy+9yz+3zx+4y

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C

5xy+9yz+2zx+5x4y

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D

5xy+9yz+3zx+5x4y

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Solution

## The correct option is D 5xy+9yz+3zx+5x−4y Given: A=(7xy+5yz−3zx) B=(4yz+9zx−4y) C=(−3xz+5x−2xy) To find the value of A+B+C we write the expressions one below the other with the like terms appearing exactly below like terms as: 7xy+5yz−3zx 4yz+9zx−4y −2xy −3xz +5x __________________________ 5xy+9yz+3xz−4y+5x Thus, A+B+C=5xy+9yz+3xz+5x−4y.

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