Question

13xy+(-9xy)+8xy+(-12xy)

We can also do it as
taking the like terms
example-
as 13xy and 8xy ( same terms )
13+8xy=21,
-9xy-12xy= -21,so...
21+(-21)=0

=0

HOPE THIS HELPS YOU GUYS
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Answer 1

13xy + (-9xy) + 8xy + (-12xy)

= 13xy - 9xy + 8xy - 12xy

= 21xy - 21xy

= 0

Answer 2

From the given question the correct answer is:

the answer is 2(11xy+10xy).

Given :

13xy+(-9xy)+8xy+(-12xy)

To find:

13xy+(-9xy)+8xy+(-12xy)=?

Solution:

we have to solve the given expression.

so ,

13xy+(-9xy)+8xy+(-12xy

we know that ,

(+) * (-)  = -

we will write the equation according to this,

we get,

=13xy-9xy + 8xy-12xy

we will make a group

=(13xy-9xy) + (8xy-12xy)

=22xy+20xy

taking common fromn the expression

=2(11xy+10xy)

Hence, the answer is 2(11xy+10xy).