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\left(9\left(x^{2}\right)^{2}-12x^{2}+4\right)\left(2x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x^{2}-2\right)^{2}.
\left(9x^{4}-12x^{2}+4\right)\left(2x+1\right)
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
18x^{5}+9x^{4}-24x^{3}-12x^{2}+8x+4
Use the distributive property to multiply 9x^{4}-12x^{2}+4 by 2x+1.
\left(9\left(x^{2}\right)^{2}-12x^{2}+4\right)\left(2x+1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x^{2}-2\right)^{2}.
\left(9x^{4}-12x^{2}+4\right)\left(2x+1\right)
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
18x^{5}+9x^{4}-24x^{3}-12x^{2}+8x+4
Use the distributive property to multiply 9x^{4}-12x^{2}+4 by 2x+1.