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18x^{2}+8
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18x^{2}+8
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9x^{2}-12x+4+\left(3x+2\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-2\right)^{2}.
9x^{2}-12x+4+9x^{2}+12x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+2\right)^{2}.
18x^{2}-12x+4+12x+4
Combine 9x^{2} and 9x^{2} to get 18x^{2}.
18x^{2}+4+4
Combine -12x and 12x to get 0.
18x^{2}+8
Add 4 and 4 to get 8.
9x^{2}-12x+4+\left(3x+2\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-2\right)^{2}.
9x^{2}-12x+4+9x^{2}+12x+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+2\right)^{2}.
18x^{2}-12x+4+12x+4
Combine 9x^{2} and 9x^{2} to get 18x^{2}.
18x^{2}+4+4
Combine -12x and 12x to get 0.
18x^{2}+8
Add 4 and 4 to get 8.
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