Eliminate the parameter to find a Cartesian equation of this curve

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I got $y=x^\frac{7}{2}$ as the cartesian equation for the following parametric equations, but it is showing up as incorrect. Can anyone explain to me what I did wrong? Thank you! 1

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$$y=t^2.t^2.t^2.t$$ $$t^2=x$$ and $$t=\pm \sqrt{x}$$ so $$y=\pm x^{\frac{7}{2}}$$