2x^2+29x+85=0

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Solution for 2x^2+29x+85=0 equation:


Simplifying
2x2 + 29x + 85 = 0

Reorder the terms:
85 + 29x + 2x2 = 0

Solving
85 + 29x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
42.5 + 14.5x + x2 = 0

Move the constant term to the right:

Add '-42.5' to each side of the equation.
42.5 + 14.5x + -42.5 + x2 = 0 + -42.5

Reorder the terms:
42.5 + -42.5 + 14.5x + x2 = 0 + -42.5

Combine like terms: 42.5 + -42.5 = 0.0
0.0 + 14.5x + x2 = 0 + -42.5
14.5x + x2 = 0 + -42.5

Combine like terms: 0 + -42.5 = -42.5
14.5x + x2 = -42.5

The x term is 14.5x.  Take half its coefficient (7.25).
Square it (52.5625) and add it to both sides.

Add '52.5625' to each side of the equation.
14.5x + 52.5625 + x2 = -42.5 + 52.5625

Reorder the terms:
52.5625 + 14.5x + x2 = -42.5 + 52.5625

Combine like terms: -42.5 + 52.5625 = 10.0625
52.5625 + 14.5x + x2 = 10.0625

Factor a perfect square on the left side:
(x + 7.25)(x + 7.25) = 10.0625

Calculate the square root of the right side: 3.172144385

Break this problem into two subproblems by setting 
(x + 7.25) equal to 3.172144385 and -3.172144385.

Subproblem 1

x + 7.25 = 3.172144385 Simplifying x + 7.25 = 3.172144385 Reorder the terms: 7.25 + x = 3.172144385 Solving 7.25 + x = 3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.25' to each side of the equation. 7.25 + -7.25 + x = 3.172144385 + -7.25 Combine like terms: 7.25 + -7.25 = 0.00 0.00 + x = 3.172144385 + -7.25 x = 3.172144385 + -7.25 Combine like terms: 3.172144385 + -7.25 = -4.077855615 x = -4.077855615 Simplifying x = -4.077855615

Subproblem 2

x + 7.25 = -3.172144385 Simplifying x + 7.25 = -3.172144385 Reorder the terms: 7.25 + x = -3.172144385 Solving 7.25 + x = -3.172144385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.25' to each side of the equation. 7.25 + -7.25 + x = -3.172144385 + -7.25 Combine like terms: 7.25 + -7.25 = 0.00 0.00 + x = -3.172144385 + -7.25 x = -3.172144385 + -7.25 Combine like terms: -3.172144385 + -7.25 = -10.422144385 x = -10.422144385 Simplifying x = -10.422144385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.077855615, -10.422144385}

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