17x^2+128x+216=0

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Solution for 17x^2+128x+216=0 equation:


Simplifying
17x2 + 128x + 216 = 0

Reorder the terms:
216 + 128x + 17x2 = 0

Solving
216 + 128x + 17x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
17 the coefficient of the squared term: 

Divide each side by '17'.
12.70588235 + 7.529411765x + x2 = 0

Move the constant term to the right:

Add '-12.70588235' to each side of the equation.
12.70588235 + 7.529411765x + -12.70588235 + x2 = 0 + -12.70588235

Reorder the terms:
12.70588235 + -12.70588235 + 7.529411765x + x2 = 0 + -12.70588235

Combine like terms: 12.70588235 + -12.70588235 = 0.00000000
0.00000000 + 7.529411765x + x2 = 0 + -12.70588235
7.529411765x + x2 = 0 + -12.70588235

Combine like terms: 0 + -12.70588235 = -12.70588235
7.529411765x + x2 = -12.70588235

The x term is 7.529411765x.  Take half its coefficient (3.764705883).
Square it (14.17301039) and add it to both sides.

Add '14.17301039' to each side of the equation.
7.529411765x + 14.17301039 + x2 = -12.70588235 + 14.17301039

Reorder the terms:
14.17301039 + 7.529411765x + x2 = -12.70588235 + 14.17301039

Combine like terms: -12.70588235 + 14.17301039 = 1.46712804
14.17301039 + 7.529411765x + x2 = 1.46712804

Factor a perfect square on the left side:
(x + 3.764705883)(x + 3.764705883) = 1.46712804

Calculate the square root of the right side: 1.21125061

Break this problem into two subproblems by setting 
(x + 3.764705883) equal to 1.21125061 and -1.21125061.

Subproblem 1

x + 3.764705883 = 1.21125061 Simplifying x + 3.764705883 = 1.21125061 Reorder the terms: 3.764705883 + x = 1.21125061 Solving 3.764705883 + x = 1.21125061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.764705883' to each side of the equation. 3.764705883 + -3.764705883 + x = 1.21125061 + -3.764705883 Combine like terms: 3.764705883 + -3.764705883 = 0.000000000 0.000000000 + x = 1.21125061 + -3.764705883 x = 1.21125061 + -3.764705883 Combine like terms: 1.21125061 + -3.764705883 = -2.553455273 x = -2.553455273 Simplifying x = -2.553455273

Subproblem 2

x + 3.764705883 = -1.21125061 Simplifying x + 3.764705883 = -1.21125061 Reorder the terms: 3.764705883 + x = -1.21125061 Solving 3.764705883 + x = -1.21125061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.764705883' to each side of the equation. 3.764705883 + -3.764705883 + x = -1.21125061 + -3.764705883 Combine like terms: 3.764705883 + -3.764705883 = 0.000000000 0.000000000 + x = -1.21125061 + -3.764705883 x = -1.21125061 + -3.764705883 Combine like terms: -1.21125061 + -3.764705883 = -4.975956493 x = -4.975956493 Simplifying x = -4.975956493

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.553455273, -4.975956493}

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