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Simplifying z2 + 8z + -15 = 0 Reorder the terms: -15 + 8z + z2 = 0 Solving -15 + 8z + z2 = 0 Solving for variable 'z'. Begin completing the square. Move the constant term to the right: Add '15' to each side of the equation. -15 + 8z + 15 + z2 = 0 + 15 Reorder the terms: -15 + 15 + 8z + z2 = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 8z + z2 = 0 + 15 8z + z2 = 0 + 15 Combine like terms: 0 + 15 = 15 8z + z2 = 15 The z term is 8z. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8z + 16 + z2 = 15 + 16 Reorder the terms: 16 + 8z + z2 = 15 + 16 Combine like terms: 15 + 16 = 31 16 + 8z + z2 = 31 Factor a perfect square on the left side: (z + 4)(z + 4) = 31 Calculate the square root of the right side: 5.567764363 Break this problem into two subproblems by setting (z + 4) equal to 5.567764363 and -5.567764363.Subproblem 1
z + 4 = 5.567764363 Simplifying z + 4 = 5.567764363 Reorder the terms: 4 + z = 5.567764363 Solving 4 + z = 5.567764363 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + z = 5.567764363 + -4 Combine like terms: 4 + -4 = 0 0 + z = 5.567764363 + -4 z = 5.567764363 + -4 Combine like terms: 5.567764363 + -4 = 1.567764363 z = 1.567764363 Simplifying z = 1.567764363Subproblem 2
z + 4 = -5.567764363 Simplifying z + 4 = -5.567764363 Reorder the terms: 4 + z = -5.567764363 Solving 4 + z = -5.567764363 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + z = -5.567764363 + -4 Combine like terms: 4 + -4 = 0 0 + z = -5.567764363 + -4 z = -5.567764363 + -4 Combine like terms: -5.567764363 + -4 = -9.567764363 z = -9.567764363 Simplifying z = -9.567764363Solution
The solution to the problem is based on the solutions from the subproblems. z = {1.567764363, -9.567764363}
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