x^2+14x-55=0

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Solution for x^2+14x-55=0 equation:


Simplifying
x2 + 14x + -55 = 0

Reorder the terms:
-55 + 14x + x2 = 0

Solving
-55 + 14x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + 14x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + 14x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + 14x + x2 = 0 + 55
14x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
14x + x2 = 55

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 55 + 49

Reorder the terms:
49 + 14x + x2 = 55 + 49

Combine like terms: 55 + 49 = 104
49 + 14x + x2 = 104

Factor a perfect square on the left side:
(x + 7)(x + 7) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(x + 7) equal to 10.198039027 and -10.198039027.

Subproblem 1

x + 7 = 10.198039027 Simplifying x + 7 = 10.198039027 Reorder the terms: 7 + x = 10.198039027 Solving 7 + x = 10.198039027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 10.198039027 + -7 Combine like terms: 7 + -7 = 0 0 + x = 10.198039027 + -7 x = 10.198039027 + -7 Combine like terms: 10.198039027 + -7 = 3.198039027 x = 3.198039027 Simplifying x = 3.198039027

Subproblem 2

x + 7 = -10.198039027 Simplifying x + 7 = -10.198039027 Reorder the terms: 7 + x = -10.198039027 Solving 7 + x = -10.198039027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -10.198039027 + -7 Combine like terms: 7 + -7 = 0 0 + x = -10.198039027 + -7 x = -10.198039027 + -7 Combine like terms: -10.198039027 + -7 = -17.198039027 x = -17.198039027 Simplifying x = -17.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.198039027, -17.198039027}

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