7
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This is not an equation. Equations must have an equals sign in it. It cannot be solved.
-3/4 if the question is 3x+4y
You cannot solve it since only one side of an equation is given. If the equation was y4 + 5y2 - 84 = 0 then y4 + 12y2 - 7y2 - 84 = 0 or y2*(y2 + 12) - 7*(y2 + 12) = 0 or (y2 - 7)*(y2 + 12) = 0 then y2 = 7 or y2 = - 12 y = +or- sqrt(7) and, if you are in the complex domain, also y = +or- i*sqrt(12) where i is the imaginary square root of -1.
x=y4 /2
Assuming the vertex is 0,0 and the directrix is y=4 x^2=0
y4