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Simplifying z2 + -8z + -7 = 0 Reorder the terms: -7 + -8z + z2 = 0 Solving -7 + -8z + z2 = 0 Solving for variable 'z'. Begin completing the square. Move the constant term to the right: Add '7' to each side of the equation. -7 + -8z + 7 + z2 = 0 + 7 Reorder the terms: -7 + 7 + -8z + z2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -8z + z2 = 0 + 7 -8z + z2 = 0 + 7 Combine like terms: 0 + 7 = 7 -8z + z2 = 7 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 = 7 + 16 Reorder the terms: 16 + -8z + z2 = 7 + 16 Combine like terms: 7 + 16 = 23 16 + -8z + z2 = 23 Factor a perfect square on the left side: (z + -4)(z + -4) = 23 Calculate the square root of the right side: 4.795831523 Break this problem into two subproblems by setting (z + -4) equal to 4.795831523 and -4.795831523.Subproblem 1
z + -4 = 4.795831523 Simplifying z + -4 = 4.795831523 Reorder the terms: -4 + z = 4.795831523 Solving -4 + z = 4.795831523 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 = 4.795831523 + 4 Combine like terms: -4 + 4 = 0 0 + z = 4.795831523 + 4 z = 4.795831523 + 4 Combine like terms: 4.795831523 + 4 = 8.795831523 z = 8.795831523 Simplifying z = 8.795831523Subproblem 2
z + -4 = -4.795831523 Simplifying z + -4 = -4.795831523 Reorder the terms: -4 + z = -4.795831523 Solving -4 + z = -4.795831523 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 = -4.795831523 + 4 Combine like terms: -4 + 4 = 0 0 + z = -4.795831523 + 4 z = -4.795831523 + 4 Combine like terms: -4.795831523 + 4 = -0.795831523 z = -0.795831523 Simplifying z = -0.795831523Solution
The solution to the problem is based on the solutions from the subproblems. z = {8.795831523, -0.795831523}
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