x^2+4x+25-4=169

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Solution for x^2+4x+25-4=169 equation:


Simplifying
x2 + 4x + 25 + -4 = 169

Reorder the terms:
25 + -4 + 4x + x2 = 169

Combine like terms: 25 + -4 = 21
21 + 4x + x2 = 169

Solving
21 + 4x + x2 = 169

Solving for variable 'x'.

Reorder the terms:
21 + -169 + 4x + x2 = 169 + -169

Combine like terms: 21 + -169 = -148
-148 + 4x + x2 = 169 + -169

Combine like terms: 169 + -169 = 0
-148 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '148' to each side of the equation.
-148 + 4x + 148 + x2 = 0 + 148

Reorder the terms:
-148 + 148 + 4x + x2 = 0 + 148

Combine like terms: -148 + 148 = 0
0 + 4x + x2 = 0 + 148
4x + x2 = 0 + 148

Combine like terms: 0 + 148 = 148
4x + x2 = 148

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 148 + 4

Reorder the terms:
4 + 4x + x2 = 148 + 4

Combine like terms: 148 + 4 = 152
4 + 4x + x2 = 152

Factor a perfect square on the left side:
(x + 2)(x + 2) = 152

Calculate the square root of the right side: 12.328828006

Break this problem into two subproblems by setting 
(x + 2) equal to 12.328828006 and -12.328828006.

Subproblem 1

x + 2 = 12.328828006 Simplifying x + 2 = 12.328828006 Reorder the terms: 2 + x = 12.328828006 Solving 2 + x = 12.328828006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 12.328828006 + -2 Combine like terms: 2 + -2 = 0 0 + x = 12.328828006 + -2 x = 12.328828006 + -2 Combine like terms: 12.328828006 + -2 = 10.328828006 x = 10.328828006 Simplifying x = 10.328828006

Subproblem 2

x + 2 = -12.328828006 Simplifying x + 2 = -12.328828006 Reorder the terms: 2 + x = -12.328828006 Solving 2 + x = -12.328828006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -12.328828006 + -2 Combine like terms: 2 + -2 = 0 0 + x = -12.328828006 + -2 x = -12.328828006 + -2 Combine like terms: -12.328828006 + -2 = -14.328828006 x = -14.328828006 Simplifying x = -14.328828006

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.328828006, -14.328828006}

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