When $7 x y + 5 y z - 3 z x$ , $4 y z + 9 z x - 4 y$ and $- 3 x z + 5 x - 2 x y$ are added, we get

5xy + 9yz + 3zx + 5x – 4y

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5xy + 9yz + 15zx + 5x – 4y

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5xy + 9yz - 3zx + 5x – 4y

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5xy + 9yz + 3zx - 5x – 4y

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Solution

The correct option is A: $5 x y + 9 y z + 3 z x + 5 x - 4 y$
$(7 x y + 5 y z - 3 z x) + (4 y z + 9 z x - 4 y) + (- 2 x y - 3 x z + 5 x)$
$= 7 x y + 5 y z - 3 z x + 4 y z + 9 z x - 4 y - 2 x y - 3 x z + 5 x$
$= 7 x y - 2 x y + 5 y z + 4 y z - 3 z x + 9 z x - 3 x z + 5 x - 4 y$
$= 5 x y + 9 y z + 3 z x + 5 x - 4 y$

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Similar questions

When $7 x y + 5 y z - 3 z x$ , $4 y z + 9 z x - 4 y$ and $- 3 x z + 5 x - 2 x y$ are added, we get $5 x y + 9 y z + 3 z x + 5 x - 4 y$ .

Find the value of $A + B + C$ if :

$A = (7 x y + 5 y z - 3 z x)$
$B = (4 y z + 9 z x - 4 y)$
$C = (- 3 x z + 5 x - 2 x y)$

5 x y + 9 y z + 3 z x + 5 x - 4 y

Solve the following:
Add $7 x y + 5 y z - 3 z x, 4 y z + 9 z x - 4 y, - 3 x z + 5 x - 2 y$

When $4 y z + 9 z x - 4 y$ and $- 3 x z + 5 x - 2 x y$ are added, we get $4 y z + 6 x z - 2 x y - 4 y + 5 x$ .

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