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Simplifying 4x4 + -15x2 + 4 = 0 Reorder the terms: 4 + -15x2 + 4x4 = 0 Solving 4 + -15x2 + 4x4 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 1 + -3.75x2 + x4 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + -3.75x2 + -1 + x4 = 0 + -1 Reorder the terms: 1 + -1 + -3.75x2 + x4 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3.75x2 + x4 = 0 + -1 -3.75x2 + x4 = 0 + -1 Combine like terms: 0 + -1 = -1 -3.75x2 + x4 = -1 The x term is -3.75x2. Take half its coefficient (-1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. -3.75x2 + 3.515625 + x4 = -1 + 3.515625 Reorder the terms: 3.515625 + -3.75x2 + x4 = -1 + 3.515625 Combine like terms: -1 + 3.515625 = 2.515625 3.515625 + -3.75x2 + x4 = 2.515625 Factor a perfect square on the left side: (x2 + -1.875)(x2 + -1.875) = 2.515625 Calculate the square root of the right side: 1.586072193 Break this problem into two subproblems by setting (x2 + -1.875) equal to 1.586072193 and -1.586072193.Subproblem 1
x2 + -1.875 = 1.586072193 Simplifying x2 + -1.875 = 1.586072193 Reorder the terms: -1.875 + x2 = 1.586072193 Solving -1.875 + x2 = 1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x2 = 1.586072193 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x2 = 1.586072193 + 1.875 x2 = 1.586072193 + 1.875 Combine like terms: 1.586072193 + 1.875 = 3.461072193 x2 = 3.461072193 Simplifying x2 = 3.461072193 Take the square root of each side: x = {-1.860395709, 1.860395709}Subproblem 2
x2 + -1.875 = -1.586072193 Simplifying x2 + -1.875 = -1.586072193 Reorder the terms: -1.875 + x2 = -1.586072193 Solving -1.875 + x2 = -1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x2 = -1.586072193 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x2 = -1.586072193 + 1.875 x2 = -1.586072193 + 1.875 Combine like terms: -1.586072193 + 1.875 = 0.288927807 x2 = 0.288927807 Simplifying x2 = 0.288927807 Take the square root of each side: x = {-0.537520053, 0.537520053}Solution
The solution to the problem is based on the solutions from the subproblems. x = {-1.860395709, 1.860395709, -0.537520053, 0.537520053}
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