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25\left(x^{2}\right)^{2}-20x^{2}+4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x^{2}-2\right)^{2}.
25x^{4}-20x^{2}+4
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
25\left(x^{2}\right)^{2}-20x^{2}+4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x^{2}-2\right)^{2}.
25x^{4}-20x^{2}+4
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.