-x^4-243+20x^2=0

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Solution for -x^4-243+20x^2=0 equation:


Simplifying
-1x4 + -243 + 20x2 = 0

Reorder the terms:
-243 + 20x2 + -1x4 = 0

Solving
-243 + 20x2 + -1x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
243 + -20x2 + x4 = 0

Move the constant term to the right:

Add '-243' to each side of the equation.
243 + -20x2 + -243 + x4 = 0 + -243

Reorder the terms:
243 + -243 + -20x2 + x4 = 0 + -243

Combine like terms: 243 + -243 = 0
0 + -20x2 + x4 = 0 + -243
-20x2 + x4 = 0 + -243

Combine like terms: 0 + -243 = -243
-20x2 + x4 = -243

The x term is -20x2.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x2 + 100 + x4 = -243 + 100

Reorder the terms:
100 + -20x2 + x4 = -243 + 100

Combine like terms: -243 + 100 = -143
100 + -20x2 + x4 = -143

Factor a perfect square on the left side:
(x2 + -10)(x2 + -10) = -143

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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