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Simplifying z2 + 2z = 20 Reorder the terms: 2z + z2 = 20 Solving 2z + z2 = 20 Solving for variable 'z'. Reorder the terms: -20 + 2z + z2 = 20 + -20 Combine like terms: 20 + -20 = 0 -20 + 2z + z2 = 0 Begin completing the square. Move the constant term to the right: Add '20' to each side of the equation. -20 + 2z + 20 + z2 = 0 + 20 Reorder the terms: -20 + 20 + 2z + z2 = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 2z + z2 = 0 + 20 2z + z2 = 0 + 20 Combine like terms: 0 + 20 = 20 2z + z2 = 20 The z term is 2z. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2z + 1 + z2 = 20 + 1 Reorder the terms: 1 + 2z + z2 = 20 + 1 Combine like terms: 20 + 1 = 21 1 + 2z + z2 = 21 Factor a perfect square on the left side: (z + 1)(z + 1) = 21 Calculate the square root of the right side: 4.582575695 Break this problem into two subproblems by setting (z + 1) equal to 4.582575695 and -4.582575695.Subproblem 1
z + 1 = 4.582575695 Simplifying z + 1 = 4.582575695 Reorder the terms: 1 + z = 4.582575695 Solving 1 + z = 4.582575695 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + z = 4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + z = 4.582575695 + -1 z = 4.582575695 + -1 Combine like terms: 4.582575695 + -1 = 3.582575695 z = 3.582575695 Simplifying z = 3.582575695Subproblem 2
z + 1 = -4.582575695 Simplifying z + 1 = -4.582575695 Reorder the terms: 1 + z = -4.582575695 Solving 1 + z = -4.582575695 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + z = -4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + z = -4.582575695 + -1 z = -4.582575695 + -1 Combine like terms: -4.582575695 + -1 = -5.582575695 z = -5.582575695 Simplifying z = -5.582575695Solution
The solution to the problem is based on the solutions from the subproblems. z = {3.582575695, -5.582575695}
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