2x^2+14x-3551=0

Solution for 2x^2+14x-3551=0 equation:

Simplifying
2x2 + 14x + -3551 = 0

Reorder the terms:
-3551 + 14x + 2x2 = 0

Solving
-3551 + 14x + 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'.
-1775.5 + 7x + x2 = 0

Move the constant term to the right:

Add '1775.5' to each side of the equation.
-1775.5 + 7x + 1775.5 + x2 = 0 + 1775.5

Reorder the terms:
-1775.5 + 1775.5 + 7x + x2 = 0 + 1775.5

Combine like terms: -1775.5 + 1775.5 = 0.0
0.0 + 7x + x2 = 0 + 1775.5
7x + x2 = 0 + 1775.5

Combine like terms: 0 + 1775.5 = 1775.5
7x + x2 = 1775.5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 1775.5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 1775.5 + 12.25

Combine like terms: 1775.5 + 12.25 = 1787.75
12.25 + 7x + x2 = 1787.75

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 1787.75

Calculate the square root of the right side: 42.281792772

Break this problem into two subproblems by setting 
(x + 3.5) equal to 42.281792772 and -42.281792772.

Subproblem 1
x + 3.5 = 42.281792772

Simplifying
x + 3.5 = 42.281792772

Reorder the terms:
3.5 + x = 42.281792772

Solving
3.5 + x = 42.281792772

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3.5' to each side of the equation.
3.5 + -3.5 + x = 42.281792772 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + x = 42.281792772 + -3.5
x = 42.281792772 + -3.5

Combine like terms: 42.281792772 + -3.5 = 38.781792772
x = 38.781792772

Simplifying
x = 38.781792772

Subproblem 2
x + 3.5 = -42.281792772

Simplifying
x + 3.5 = -42.281792772

Reorder the terms:
3.5 + x = -42.281792772

Solving
3.5 + x = -42.281792772

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3.5' to each side of the equation.
3.5 + -3.5 + x = -42.281792772 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + x = -42.281792772 + -3.5
x = -42.281792772 + -3.5

Combine like terms: -42.281792772 + -3.5 = -45.781792772
x = -45.781792772

Simplifying
x = -45.781792772

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {38.781792772, -45.781792772}