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Simplifying 2z + 7z2 + -9z + 21z3 = 0 Reorder the terms: 2z + -9z + 7z2 + 21z3 = 0 Combine like terms: 2z + -9z = -7z -7z + 7z2 + 21z3 = 0 Solving -7z + 7z2 + 21z3 = 0 Solving for variable 'z'. Factor out the Greatest Common Factor (GCF), '7z'. 7z(-1 + z + 3z2) = 0 Ignore the factor 7.Subproblem 1
Set the factor 'z' equal to zero and attempt to solve: Simplifying z = 0 Solving z = 0 Move all terms containing z to the left, all other terms to the right. Simplifying z = 0Subproblem 2
Set the factor '(-1 + z + 3z2)' equal to zero and attempt to solve: Simplifying -1 + z + 3z2 = 0 Solving -1 + z + 3z2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -0.3333333333 + 0.3333333333z + z2 = 0 Move the constant term to the right: Add '0.3333333333' to each side of the equation. -0.3333333333 + 0.3333333333z + 0.3333333333 + z2 = 0 + 0.3333333333 Reorder the terms: -0.3333333333 + 0.3333333333 + 0.3333333333z + z2 = 0 + 0.3333333333 Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000 0.0000000000 + 0.3333333333z + z2 = 0 + 0.3333333333 0.3333333333z + z2 = 0 + 0.3333333333 Combine like terms: 0 + 0.3333333333 = 0.3333333333 0.3333333333z + z2 = 0.3333333333 The z term is z. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. 0.3333333333z + 0.25 + z2 = 0.3333333333 + 0.25 Reorder the terms: 0.25 + 0.3333333333z + z2 = 0.3333333333 + 0.25 Combine like terms: 0.3333333333 + 0.25 = 0.5833333333 0.25 + 0.3333333333z + z2 = 0.5833333333 Factor a perfect square on the left side: (z + 0.5)(z + 0.5) = 0.5833333333 Calculate the square root of the right side: 0.763762616 Break this problem into two subproblems by setting (z + 0.5) equal to 0.763762616 and -0.763762616.Subproblem 1
z + 0.5 = 0.763762616 Simplifying z + 0.5 = 0.763762616 Reorder the terms: 0.5 + z = 0.763762616 Solving 0.5 + z = 0.763762616 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + z = 0.763762616 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + z = 0.763762616 + -0.5 z = 0.763762616 + -0.5 Combine like terms: 0.763762616 + -0.5 = 0.263762616 z = 0.263762616 Simplifying z = 0.263762616Subproblem 2
z + 0.5 = -0.763762616 Simplifying z + 0.5 = -0.763762616 Reorder the terms: 0.5 + z = -0.763762616 Solving 0.5 + z = -0.763762616 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + z = -0.763762616 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + z = -0.763762616 + -0.5 z = -0.763762616 + -0.5 Combine like terms: -0.763762616 + -0.5 = -1.263762616 z = -1.263762616 Simplifying z = -1.263762616Solution
The solution to the problem is based on the solutions from the subproblems. z = {0.263762616, -1.263762616}Solution
z = {0, 0.263762616, -1.263762616}
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