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\left(2x^{2}-x\right)^{2}
Multiply 2x^{2}-x and 2x^{2}-x to get \left(2x^{2}-x\right)^{2}.
4\left(x^{2}\right)^{2}-4x^{2}x+x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x^{2}-x\right)^{2}.
4x^{4}-4x^{2}x+x^{2}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
4x^{4}-4x^{3}+x^{2}
To multiply powers of the same base, add their exponents. Add 2 and 1 to get 3.
\left(2x^{2}-x\right)^{2}
Multiply 2x^{2}-x and 2x^{2}-x to get \left(2x^{2}-x\right)^{2}.
4\left(x^{2}\right)^{2}-4x^{2}x+x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x^{2}-x\right)^{2}.
4x^{4}-4x^{2}x+x^{2}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
4x^{4}-4x^{3}+x^{2}
To multiply powers of the same base, add their exponents. Add 2 and 1 to get 3.