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x^{2}+2x-yx-2y-\left(x+y\right)\left(x-2\right)
Apply the distributive property by multiplying each term of x-y by each term of x+2.
x^{2}+2x-yx-2y-\left(x^{2}-2x+yx-2y\right)
Apply the distributive property by multiplying each term of x+y by each term of x-2.
x^{2}+2x-yx-2y-x^{2}-\left(-2x\right)-yx-\left(-2y\right)
To find the opposite of x^{2}-2x+yx-2y, find the opposite of each term.
x^{2}+2x-yx-2y-x^{2}+2x-yx-\left(-2y\right)
The opposite of -2x is 2x.
x^{2}+2x-yx-2y-x^{2}+2x-yx+2y
The opposite of -2y is 2y.
2x-yx-2y+2x-yx+2y
Combine x^{2} and -x^{2} to get 0.
4x-yx-2y-yx+2y
Combine 2x and 2x to get 4x.
4x-2yx-2y+2y
Combine -yx and -yx to get -2yx.
4x-2yx
Combine -2y and 2y to get 0.
x^{2}+2x-yx-2y-\left(x+y\right)\left(x-2\right)
Apply the distributive property by multiplying each term of x-y by each term of x+2.
x^{2}+2x-yx-2y-\left(x^{2}-2x+yx-2y\right)
Apply the distributive property by multiplying each term of x+y by each term of x-2.
x^{2}+2x-yx-2y-x^{2}-\left(-2x\right)-yx-\left(-2y\right)
To find the opposite of x^{2}-2x+yx-2y, find the opposite of each term.
x^{2}+2x-yx-2y-x^{2}+2x-yx-\left(-2y\right)
The opposite of -2x is 2x.
x^{2}+2x-yx-2y-x^{2}+2x-yx+2y
The opposite of -2y is 2y.
2x-yx-2y+2x-yx+2y
Combine x^{2} and -x^{2} to get 0.
4x-yx-2y-yx+2y
Combine 2x and 2x to get 4x.
4x-2yx-2y+2y
Combine -yx and -yx to get -2yx.
4x-2yx
Combine -2y and 2y to get 0.