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\left(-x\right)x+2\left(-x\right)+\left(x+3\right)\left(x-3\right)
Use the distributive property to multiply -x by x+2.
\left(-x\right)x+2\left(-x\right)+x^{2}-3^{2}
Consider \left(x+3\right)\left(x-3\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\left(-x\right)x+2\left(-x\right)+x^{2}-9
Calculate 3 to the power of 2 and get 9.
-x^{2}+2\left(-1\right)x+x^{2}-9
Multiply x and x to get x^{2}.
-x^{2}-2x+x^{2}-9
Multiply 2 and -1 to get -2.
-2x-9
Combine -x^{2} and x^{2} to get 0.
\left(-x\right)x+2\left(-x\right)+\left(x+3\right)\left(x-3\right)
Use the distributive property to multiply -x by x+2.
\left(-x\right)x+2\left(-x\right)+x^{2}-3^{2}
Consider \left(x+3\right)\left(x-3\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\left(-x\right)x+2\left(-x\right)+x^{2}-9
Calculate 3 to the power of 2 and get 9.
-x^{2}+2\left(-1\right)x+x^{2}-9
Multiply x and x to get x^{2}.
-x^{2}-2x+x^{2}-9
Multiply 2 and -1 to get -2.
-2x-9
Combine -x^{2} and x^{2} to get 0.