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Simplifying 16y4 + -20y2 + 5 = 0 Reorder the terms: 5 + -20y2 + 16y4 = 0 Solving 5 + -20y2 + 16y4 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 16 the coefficient of the squared term: Divide each side by '16'. 0.3125 + -1.25y2 + y4 = 0 Move the constant term to the right: Add '-0.3125' to each side of the equation. 0.3125 + -1.25y2 + -0.3125 + y4 = 0 + -0.3125 Reorder the terms: 0.3125 + -0.3125 + -1.25y2 + y4 = 0 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + -1.25y2 + y4 = 0 + -0.3125 -1.25y2 + y4 = 0 + -0.3125 Combine like terms: 0 + -0.3125 = -0.3125 -1.25y2 + y4 = -0.3125 The y term is -1.25y2. Take half its coefficient (-0.625). Square it (0.390625) and add it to both sides. Add '0.390625' to each side of the equation. -1.25y2 + 0.390625 + y4 = -0.3125 + 0.390625 Reorder the terms: 0.390625 + -1.25y2 + y4 = -0.3125 + 0.390625 Combine like terms: -0.3125 + 0.390625 = 0.078125 0.390625 + -1.25y2 + y4 = 0.078125 Factor a perfect square on the left side: (y2 + -0.625)(y2 + -0.625) = 0.078125 Calculate the square root of the right side: 0.279508497 Break this problem into two subproblems by setting (y2 + -0.625) equal to 0.279508497 and -0.279508497.Subproblem 1
y2 + -0.625 = 0.279508497 Simplifying y2 + -0.625 = 0.279508497 Reorder the terms: -0.625 + y2 = 0.279508497 Solving -0.625 + y2 = 0.279508497 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + y2 = 0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y2 = 0.279508497 + 0.625 y2 = 0.279508497 + 0.625 Combine like terms: 0.279508497 + 0.625 = 0.904508497 y2 = 0.904508497 Simplifying y2 = 0.904508497 Take the square root of each side: y = {-0.951056516, 0.951056516}Subproblem 2
y2 + -0.625 = -0.279508497 Simplifying y2 + -0.625 = -0.279508497 Reorder the terms: -0.625 + y2 = -0.279508497 Solving -0.625 + y2 = -0.279508497 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + y2 = -0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + y2 = -0.279508497 + 0.625 y2 = -0.279508497 + 0.625 Combine like terms: -0.279508497 + 0.625 = 0.345491503 y2 = 0.345491503 Simplifying y2 = 0.345491503 Take the square root of each side: y = {-0.587785252, 0.587785252}Solution
The solution to the problem is based on the solutions from the subproblems. y = {-0.951056516, 0.951056516, -0.587785252, 0.587785252}
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