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Sagot :
For addition:
-Combine all the like terms...
-If the equation is 4xy+17xy-12x, then you add 4xy and 17xy because they are like terms.
-So, you get 21xy-12x. You don't do anything else because there are no more like terms.
For subtraction:
-If the equation is 3xy+6z-(7xy-12x), then you must first change the signs of the numbers within the parenthesis.
-So, the equation becomes 3xy+6z-7xy+12x.
-Combine all the like terms, and you get -4xy+6z-12x.
-Combine all the like terms...
-If the equation is 4xy+17xy-12x, then you add 4xy and 17xy because they are like terms.
-So, you get 21xy-12x. You don't do anything else because there are no more like terms.
For subtraction:
-If the equation is 3xy+6z-(7xy-12x), then you must first change the signs of the numbers within the parenthesis.
-So, the equation becomes 3xy+6z-7xy+12x.
-Combine all the like terms, and you get -4xy+6z-12x.
ADDITION
For example ...
(2xy + 3y - 2) + (5xy - 2y + 3)
2xy + 3y - 2
+ 5xy - 2y + 3
= 7xy + 1y + 1
1y can be just "y" ...
Add the like terms. Add the integers as usual...
SUBTRACTION
For example...
(2ab + 3b - 2c) - (5ab - 3b + 2c) Subtract as usual so the signs of the other polynomial will change..
2ab + 3b - 2c
- -5ab + 3b - 2c
= -3ab + 6b - 4c
Just add and subtract the integers in the polynomials as usual while the variables remains the same.
For example ...
(2xy + 3y - 2) + (5xy - 2y + 3)
2xy + 3y - 2
+ 5xy - 2y + 3
= 7xy + 1y + 1
1y can be just "y" ...
Add the like terms. Add the integers as usual...
SUBTRACTION
For example...
(2ab + 3b - 2c) - (5ab - 3b + 2c) Subtract as usual so the signs of the other polynomial will change..
2ab + 3b - 2c
- -5ab + 3b - 2c
= -3ab + 6b - 4c
Just add and subtract the integers in the polynomials as usual while the variables remains the same.
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