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Simplifying x4 + -7x2 + 4 = 0 Reorder the terms: 4 + -7x2 + x4 = 0 Solving 4 + -7x2 + x4 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-4' to each side of the equation. 4 + -7x2 + -4 + x4 = 0 + -4 Reorder the terms: 4 + -4 + -7x2 + x4 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7x2 + x4 = 0 + -4 -7x2 + x4 = 0 + -4 Combine like terms: 0 + -4 = -4 -7x2 + x4 = -4 The x term is -7x2. Take half its coefficient (-3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. -7x2 + 12.25 + x4 = -4 + 12.25 Reorder the terms: 12.25 + -7x2 + x4 = -4 + 12.25 Combine like terms: -4 + 12.25 = 8.25 12.25 + -7x2 + x4 = 8.25 Factor a perfect square on the left side: (x2 + -3.5)(x2 + -3.5) = 8.25 Calculate the square root of the right side: 2.872281323 Break this problem into two subproblems by setting (x2 + -3.5) equal to 2.872281323 and -2.872281323.Subproblem 1
x2 + -3.5 = 2.872281323 Simplifying x2 + -3.5 = 2.872281323 Reorder the terms: -3.5 + x2 = 2.872281323 Solving -3.5 + x2 = 2.872281323 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x2 = 2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = 2.872281323 + 3.5 x2 = 2.872281323 + 3.5 Combine like terms: 2.872281323 + 3.5 = 6.372281323 x2 = 6.372281323 Simplifying x2 = 6.372281323 Take the square root of each side: x = {-2.524337799, 2.524337799}Subproblem 2
x2 + -3.5 = -2.872281323 Simplifying x2 + -3.5 = -2.872281323 Reorder the terms: -3.5 + x2 = -2.872281323 Solving -3.5 + x2 = -2.872281323 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x2 = -2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = -2.872281323 + 3.5 x2 = -2.872281323 + 3.5 Combine like terms: -2.872281323 + 3.5 = 0.627718677 x2 = 0.627718677 Simplifying x2 = 0.627718677 Take the square root of each side: x = {-0.792286992, 0.792286992}Solution
The solution to the problem is based on the solutions from the subproblems. x = {-2.524337799, 2.524337799, -0.792286992, 0.792286992}
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