Question

If we add, 7xy + 5yz – 3zx, 4yz + 9zx – 4y and –3xz + 5x – 2xy, then the answer is:

A. 5xy + 9yz +3zx + 5x – 4y

B. 5xy – 9yz +3zx – 5x – 4y

C. 5xy + 10yz +3zx + 15x – 4y

D. 5xy + 10yz +3zx + 5x – 6y​

Answer 1

Adding the three expressions, we get

$5xy+9yz+3zx-4y+5x$

Step-by-step explanation:

Adding the given three expressions, i.e., 7xy + 5yz – 3zx, 4yz + 9zx – 4y and –3xz + 5x – 2xy, we get,

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

Therefore, the sum of the three expressions is

$5xy+9yz+3zx-4y+5x$.

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Answer 2

Answer:

A is the answer.............................