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18x^{3}+a^{3}
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18x^{3}+a^{3}
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18x^{3}-6x^{2}a+2xa^{2}+a\left(6x^{2}-2ax+a^{2}\right)
Use the distributive property to multiply 2x by 9x^{2}-3ax+a^{2}.
18x^{3}-6x^{2}a+2xa^{2}+6ax^{2}-2xa^{2}+a^{3}
Use the distributive property to multiply a by 6x^{2}-2ax+a^{2}.
18x^{3}+2xa^{2}-2xa^{2}+a^{3}
Combine -6x^{2}a and 6ax^{2} to get 0.
18x^{3}+a^{3}
Combine 2xa^{2} and -2xa^{2} to get 0.
18x^{3}-6x^{2}a+2xa^{2}+a\left(6x^{2}-2ax+a^{2}\right)
Use the distributive property to multiply 2x by 9x^{2}-3ax+a^{2}.
18x^{3}-6x^{2}a+2xa^{2}+6ax^{2}-2xa^{2}+a^{3}
Use the distributive property to multiply a by 6x^{2}-2ax+a^{2}.
18x^{3}+2xa^{2}-2xa^{2}+a^{3}
Combine -6x^{2}a and 6ax^{2} to get 0.
18x^{3}+a^{3}
Combine 2xa^{2} and -2xa^{2} to get 0.
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