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Simplifying y2 + -20y = 90 Reorder the terms: -20y + y2 = 90 Solving -20y + y2 = 90 Solving for variable 'y'. Reorder the terms: -90 + -20y + y2 = 90 + -90 Combine like terms: 90 + -90 = 0 -90 + -20y + y2 = 0 Begin completing the square. Move the constant term to the right: Add '90' to each side of the equation. -90 + -20y + 90 + y2 = 0 + 90 Reorder the terms: -90 + 90 + -20y + y2 = 0 + 90 Combine like terms: -90 + 90 = 0 0 + -20y + y2 = 0 + 90 -20y + y2 = 0 + 90 Combine like terms: 0 + 90 = 90 -20y + y2 = 90 The y term is -20y. Take half its coefficient (-10). Square it (100) and add it to both sides. Add '100' to each side of the equation. -20y + 100 + y2 = 90 + 100 Reorder the terms: 100 + -20y + y2 = 90 + 100 Combine like terms: 90 + 100 = 190 100 + -20y + y2 = 190 Factor a perfect square on the left side: (y + -10)(y + -10) = 190 Calculate the square root of the right side: 13.784048752 Break this problem into two subproblems by setting (y + -10) equal to 13.784048752 and -13.784048752.Subproblem 1
y + -10 = 13.784048752 Simplifying y + -10 = 13.784048752 Reorder the terms: -10 + y = 13.784048752 Solving -10 + y = 13.784048752 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = 13.784048752 + 10 Combine like terms: -10 + 10 = 0 0 + y = 13.784048752 + 10 y = 13.784048752 + 10 Combine like terms: 13.784048752 + 10 = 23.784048752 y = 23.784048752 Simplifying y = 23.784048752Subproblem 2
y + -10 = -13.784048752 Simplifying y + -10 = -13.784048752 Reorder the terms: -10 + y = -13.784048752 Solving -10 + y = -13.784048752 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = -13.784048752 + 10 Combine like terms: -10 + 10 = 0 0 + y = -13.784048752 + 10 y = -13.784048752 + 10 Combine like terms: -13.784048752 + 10 = -3.784048752 y = -3.784048752 Simplifying y = -3.784048752Solution
The solution to the problem is based on the solutions from the subproblems. y = {23.784048752, -3.784048752}
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