2y^4-3y^2+18=0

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Solution for 2y^4-3y^2+18=0 equation:


Simplifying
2y4 + -3y2 + 18 = 0

Reorder the terms:
18 + -3y2 + 2y4 = 0

Solving
18 + -3y2 + 2y4 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
9 + -1.5y2 + y4 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -1.5y2 + -9 + y4 = 0 + -9

Reorder the terms:
9 + -9 + -1.5y2 + y4 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1.5y2 + y4 = 0 + -9
-1.5y2 + y4 = 0 + -9

Combine like terms: 0 + -9 = -9
-1.5y2 + y4 = -9

The y term is -1.5y2.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5y2 + 0.5625 + y4 = -9 + 0.5625

Reorder the terms:
0.5625 + -1.5y2 + y4 = -9 + 0.5625

Combine like terms: -9 + 0.5625 = -8.4375
0.5625 + -1.5y2 + y4 = -8.4375

Factor a perfect square on the left side:
(y2 + -0.75)(y2 + -0.75) = -8.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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