x^4=47x^2-98

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Solution for x^4=47x^2-98 equation:


Simplifying
x4 = 47x2 + -98

Reorder the terms:
x4 = -98 + 47x2

Solving
x4 = -98 + 47x2

Solving for variable 'x'.

Reorder the terms:
98 + -47x2 + x4 = -98 + 47x2 + 98 + -47x2

Reorder the terms:
98 + -47x2 + x4 = -98 + 98 + 47x2 + -47x2

Combine like terms: -98 + 98 = 0
98 + -47x2 + x4 = 0 + 47x2 + -47x2
98 + -47x2 + x4 = 47x2 + -47x2

Combine like terms: 47x2 + -47x2 = 0
98 + -47x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '-98' to each side of the equation.
98 + -47x2 + -98 + x4 = 0 + -98

Reorder the terms:
98 + -98 + -47x2 + x4 = 0 + -98

Combine like terms: 98 + -98 = 0
0 + -47x2 + x4 = 0 + -98
-47x2 + x4 = 0 + -98

Combine like terms: 0 + -98 = -98
-47x2 + x4 = -98

The x term is -47x2.  Take half its coefficient (-23.5).
Square it (552.25) and add it to both sides.

Add '552.25' to each side of the equation.
-47x2 + 552.25 + x4 = -98 + 552.25

Reorder the terms:
552.25 + -47x2 + x4 = -98 + 552.25

Combine like terms: -98 + 552.25 = 454.25
552.25 + -47x2 + x4 = 454.25

Factor a perfect square on the left side:
(x2 + -23.5)(x2 + -23.5) = 454.25

Calculate the square root of the right side: 21.313141486

Break this problem into two subproblems by setting 
(x2 + -23.5) equal to 21.313141486 and -21.313141486.

Subproblem 1

x2 + -23.5 = 21.313141486 Simplifying x2 + -23.5 = 21.313141486 Reorder the terms: -23.5 + x2 = 21.313141486 Solving -23.5 + x2 = 21.313141486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x2 = 21.313141486 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x2 = 21.313141486 + 23.5 x2 = 21.313141486 + 23.5 Combine like terms: 21.313141486 + 23.5 = 44.813141486 x2 = 44.813141486 Simplifying x2 = 44.813141486 Take the square root of each side: x = {-6.694261833, 6.694261833}

Subproblem 2

x2 + -23.5 = -21.313141486 Simplifying x2 + -23.5 = -21.313141486 Reorder the terms: -23.5 + x2 = -21.313141486 Solving -23.5 + x2 = -21.313141486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x2 = -21.313141486 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x2 = -21.313141486 + 23.5 x2 = -21.313141486 + 23.5 Combine like terms: -21.313141486 + 23.5 = 2.186858514 x2 = 2.186858514 Simplifying x2 = 2.186858514 Take the square root of each side: x = {-1.478803068, 1.478803068}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-6.694261833, 6.694261833, -1.478803068, 1.478803068}

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