Lets start with the 4-term Polynomial 3x+7y-21-xy
1. Identify like terms
In this case 3x and xy are similar
Also 7y and 21 are similar
2. Lets group these together
Your equation should look like this(3x-xy)+(7y-21)
3. Factoring
Remove the like terms from the equation x(3-y)+7(y-3)
This is the same thing as x(3-y)-7(3-y)
4. Identify the new common factors
(x-7)(3-y)
This how you factor by grouping for any additional help you can visit this link.
https://www.khanacademy.org/math/algebra/multiplying-factoring-expression/factoring-by-grouping/v/factor-by-grouping-and-factoring-completely
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