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Simplifying -1z2 + 9z + 20 = 0 Reorder the terms: 20 + 9z + -1z2 = 0 Solving 20 + 9z + -1z2 = 0 Solving for variable 'z'. Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -20 + -9z + z2 = 0 Move the constant term to the right: Add '20' to each side of the equation. -20 + -9z + 20 + z2 = 0 + 20 Reorder the terms: -20 + 20 + -9z + z2 = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -9z + z2 = 0 + 20 -9z + z2 = 0 + 20 Combine like terms: 0 + 20 = 20 -9z + z2 = 20 The z term is -9z. Take half its coefficient (-4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. -9z + 20.25 + z2 = 20 + 20.25 Reorder the terms: 20.25 + -9z + z2 = 20 + 20.25 Combine like terms: 20 + 20.25 = 40.25 20.25 + -9z + z2 = 40.25 Factor a perfect square on the left side: (z + -4.5)(z + -4.5) = 40.25 Calculate the square root of the right side: 6.34428877 Break this problem into two subproblems by setting (z + -4.5) equal to 6.34428877 and -6.34428877.Subproblem 1
z + -4.5 = 6.34428877 Simplifying z + -4.5 = 6.34428877 Reorder the terms: -4.5 + z = 6.34428877 Solving -4.5 + z = 6.34428877 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + z = 6.34428877 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + z = 6.34428877 + 4.5 z = 6.34428877 + 4.5 Combine like terms: 6.34428877 + 4.5 = 10.84428877 z = 10.84428877 Simplifying z = 10.84428877Subproblem 2
z + -4.5 = -6.34428877 Simplifying z + -4.5 = -6.34428877 Reorder the terms: -4.5 + z = -6.34428877 Solving -4.5 + z = -6.34428877 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + z = -6.34428877 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + z = -6.34428877 + 4.5 z = -6.34428877 + 4.5 Combine like terms: -6.34428877 + 4.5 = -1.84428877 z = -1.84428877 Simplifying z = -1.84428877Solution
The solution to the problem is based on the solutions from the subproblems. z = {10.84428877, -1.84428877}
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