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18x^{2}+32x+17
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18x^{2}+32x+17
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2\left(9x^{2}+18x+9\right)-4x-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-3\right)^{2}.
18x^{2}+36x+18-4x-1
Use the distributive property to multiply 2 by 9x^{2}+18x+9.
18x^{2}+32x+18-1
Combine 36x and -4x to get 32x.
18x^{2}+32x+17
Subtract 1 from 18 to get 17.
2\left(9x^{2}+18x+9\right)-4x-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-3\right)^{2}.
18x^{2}+36x+18-4x-1
Use the distributive property to multiply 2 by 9x^{2}+18x+9.
18x^{2}+32x+18-1
Combine 36x and -4x to get 32x.
18x^{2}+32x+17
Subtract 1 from 18 to get 17.
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