Evaluate
-2\left(x+3\right)^{2}-1
Expand
-2x^{2}-12x-19
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-2\left(x^{2}+6x+9\right)-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
-2x^{2}-12x-18-1
Use the distributive property to multiply -2 by x^{2}+6x+9.
-2x^{2}-12x-19
Subtract 1 from -18 to get -19.
-2\left(x^{2}+6x+9\right)-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
-2x^{2}-12x-18-1
Use the distributive property to multiply -2 by x^{2}+6x+9.
-2x^{2}-12x-19
Subtract 1 from -18 to get -19.
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