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6a=\left(\frac{2}{x}-x\right)^{2}
Multiply 3 and 2 to get 6.
6a=\left(\frac{2}{x}-\frac{xx}{x}\right)^{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{x}{x}.
6a=\left(\frac{2-xx}{x}\right)^{2}
Since \frac{2}{x} and \frac{xx}{x} have the same denominator, subtract them by subtracting their numerators.
6a=\left(\frac{2-x^{2}}{x}\right)^{2}
Do the multiplications in 2-xx.
6a=\frac{\left(2-x^{2}\right)^{2}}{x^{2}}
To raise \frac{2-x^{2}}{x} to a power, raise both numerator and denominator to the power and then divide.
6a=\frac{4-4x^{2}+\left(x^{2}\right)^{2}}{x^{2}}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2-x^{2}\right)^{2}.
6a=\frac{4-4x^{2}+x^{4}}{x^{2}}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
6ax^{2}=4-4x^{2}+x^{4}
Multiply both sides of the equation by x^{2}.
6x^{2}a=x^{4}-4x^{2}+4
The equation is in standard form.
\frac{6x^{2}a}{6x^{2}}=\frac{\left(x^{2}-2\right)^{2}}{6x^{2}}
Divide both sides by 6x^{2}.
a=\frac{\left(x^{2}-2\right)^{2}}{6x^{2}}
Dividing by 6x^{2} undoes the multiplication by 6x^{2}.