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\left(-x\right)^{2}-12\left(-x\right)+36
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-x-6\right)^{2}.
x^{2}-12\left(-x\right)+36
Calculate -x to the power of 2 and get x^{2}.
x^{2}+12x+36
Multiply -12 and -1 to get 12.
\left(-x\right)^{2}-12\left(-x\right)+36
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-x-6\right)^{2}.
x^{2}-12\left(-x\right)+36
Calculate -x to the power of 2 and get x^{2}.
x^{2}+12x+36
Multiply -12 and -1 to get 12.