If
$A = 9 x y + 4 y z - 4 z x, B = 5 y z + 10 z x - 4 x y, C = - 3 x z$
then $A + B + C$ is:

5 x y + 9 y z + 3 z x

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5 x y - 9 y z + 3 z x

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5 x y - 6 y z + 3 z x

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5 x y + 6 y z + 3 z x

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Solution

The correct option is A $5 x y + 9 y z + 3 z x$
Given,
$A = 9 x y + 4 y z - 4 z x, B = 5 y z + 10 z x - 4 x y, C = - 3 x z$
If we add the three expressions, then we need to combine the like terms together.
$A + B + C$ = $(9 x y - 4 x y) + (4 y z + 5 y z) - 4 z x + 10 z x - 3 x z$
$= 5 x y + 9 y z + 3 z x$

Suggest Corrections

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