49x^4-18x^2+1=0

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Solution for 49x^4-18x^2+1=0 equation:


Simplifying
49x4 + -18x2 + 1 = 0

Reorder the terms:
1 + -18x2 + 49x4 = 0

Solving
1 + -18x2 + 49x4 = 0

Solving for variable 'x'.

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

Divide each side by '49'.
0.02040816327 + -0.3673469388x2 + x4 = 0

Move the constant term to the right:

Add '-0.02040816327' to each side of the equation.
0.02040816327 + -0.3673469388x2 + -0.02040816327 + x4 = 0 + -0.02040816327

Reorder the terms:
0.02040816327 + -0.02040816327 + -0.3673469388x2 + x4 = 0 + -0.02040816327

Combine like terms: 0.02040816327 + -0.02040816327 = 0.00000000000
0.00000000000 + -0.3673469388x2 + x4 = 0 + -0.02040816327
-0.3673469388x2 + x4 = 0 + -0.02040816327

Combine like terms: 0 + -0.02040816327 = -0.02040816327
-0.3673469388x2 + x4 = -0.02040816327

The x term is -0.3673469388x2.  Take half its coefficient (-0.1836734694).
Square it (0.03373594336) and add it to both sides.

Add '0.03373594336' to each side of the equation.
-0.3673469388x2 + 0.03373594336 + x4 = -0.02040816327 + 0.03373594336

Reorder the terms:
0.03373594336 + -0.3673469388x2 + x4 = -0.02040816327 + 0.03373594336

Combine like terms: -0.02040816327 + 0.03373594336 = 0.01332778009
0.03373594336 + -0.3673469388x2 + x4 = 0.01332778009

Factor a perfect square on the left side:
(x2 + -0.1836734694)(x2 + -0.1836734694) = 0.01332778009

Calculate the square root of the right side: 0.115446005

Break this problem into two subproblems by setting 
(x2 + -0.1836734694) equal to 0.115446005 and -0.115446005.

Subproblem 1

x2 + -0.1836734694 = 0.115446005 Simplifying x2 + -0.1836734694 = 0.115446005 Reorder the terms: -0.1836734694 + x2 = 0.115446005 Solving -0.1836734694 + x2 = 0.115446005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1836734694' to each side of the equation. -0.1836734694 + 0.1836734694 + x2 = 0.115446005 + 0.1836734694 Combine like terms: -0.1836734694 + 0.1836734694 = 0.0000000000 0.0000000000 + x2 = 0.115446005 + 0.1836734694 x2 = 0.115446005 + 0.1836734694 Combine like terms: 0.115446005 + 0.1836734694 = 0.2991194744 x2 = 0.2991194744 Simplifying x2 = 0.2991194744 Take the square root of each side: x = {-0.546918161, 0.546918161}

Subproblem 2

x2 + -0.1836734694 = -0.115446005 Simplifying x2 + -0.1836734694 = -0.115446005 Reorder the terms: -0.1836734694 + x2 = -0.115446005 Solving -0.1836734694 + x2 = -0.115446005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1836734694' to each side of the equation. -0.1836734694 + 0.1836734694 + x2 = -0.115446005 + 0.1836734694 Combine like terms: -0.1836734694 + 0.1836734694 = 0.0000000000 0.0000000000 + x2 = -0.115446005 + 0.1836734694 x2 = -0.115446005 + 0.1836734694 Combine like terms: -0.115446005 + 0.1836734694 = 0.0682274644 x2 = 0.0682274644 Simplifying x2 = 0.0682274644 Take the square root of each side: x = {-0.261203875, 0.261203875}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.546918161, 0.546918161, -0.261203875, 0.261203875}

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