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-18x^{2}-2
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-18x^{2}-2
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12x-2\left(9x^{2}+6x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+1\right)^{2}.
12x-18x^{2}-12x-2
Use the distributive property to multiply -2 by 9x^{2}+6x+1.
-18x^{2}-2
Combine 12x and -12x to get 0.
12x-2\left(9x^{2}+6x+1\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+1\right)^{2}.
12x-18x^{2}-12x-2
Use the distributive property to multiply -2 by 9x^{2}+6x+1.
-18x^{2}-2
Combine 12x and -12x to get 0.
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