3y4 = 28y2 - 9
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3y4 = 28y2 - 9
I'm assuming you mean this:
Start by substituting a new variable for y^2. If we let w = y^2, then this becomes
You can rearrange to get this into a standard quadratic form, then use the quadratic formula to solve for w. There will be two soultions for w. Then finally y = sqrt(w), but be careful to check whether both positive and negative values of sqrt(w) work in the original equation.
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