x^2+14x-25.5=0

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Solution for x^2+14x-25.5=0 equation:


Simplifying
x2 + 14x + -25.5 = 0

Reorder the terms:
-25.5 + 14x + x2 = 0

Solving
-25.5 + 14x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '25.5' to each side of the equation.
-25.5 + 14x + 25.5 + x2 = 0 + 25.5

Reorder the terms:
-25.5 + 25.5 + 14x + x2 = 0 + 25.5

Combine like terms: -25.5 + 25.5 = 0.0
0.0 + 14x + x2 = 0 + 25.5
14x + x2 = 0 + 25.5

Combine like terms: 0 + 25.5 = 25.5
14x + x2 = 25.5

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 = 25.5 + 49

Reorder the terms:
49 + 14x + x2 = 25.5 + 49

Combine like terms: 25.5 + 49 = 74.5
49 + 14x + x2 = 74.5

Factor a perfect square on the left side:
(x + 7)(x + 7) = 74.5

Calculate the square root of the right side: 8.631338251

Break this problem into two subproblems by setting 
(x + 7) equal to 8.631338251 and -8.631338251.

Subproblem 1

x + 7 = 8.631338251 Simplifying x + 7 = 8.631338251 Reorder the terms: 7 + x = 8.631338251 Solving 7 + x = 8.631338251 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 = 8.631338251 + -7 Combine like terms: 7 + -7 = 0 0 + x = 8.631338251 + -7 x = 8.631338251 + -7 Combine like terms: 8.631338251 + -7 = 1.631338251 x = 1.631338251 Simplifying x = 1.631338251

Subproblem 2

x + 7 = -8.631338251 Simplifying x + 7 = -8.631338251 Reorder the terms: 7 + x = -8.631338251 Solving 7 + x = -8.631338251 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 = -8.631338251 + -7 Combine like terms: 7 + -7 = 0 0 + x = -8.631338251 + -7 x = -8.631338251 + -7 Combine like terms: -8.631338251 + -7 = -15.631338251 x = -15.631338251 Simplifying x = -15.631338251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.631338251, -15.631338251}

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