x^2-4x-4x-16=169

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Solution for x^2-4x-4x-16=169 equation:


Simplifying
x2 + -4x + -4x + -16 = 169

Reorder the terms:
-16 + -4x + -4x + x2 = 169

Combine like terms: -4x + -4x = -8x
-16 + -8x + x2 = 169

Solving
-16 + -8x + x2 = 169

Solving for variable 'x'.

Reorder the terms:
-16 + -169 + -8x + x2 = 169 + -169

Combine like terms: -16 + -169 = -185
-185 + -8x + x2 = 169 + -169

Combine like terms: 169 + -169 = 0
-185 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '185' to each side of the equation.
-185 + -8x + 185 + x2 = 0 + 185

Reorder the terms:
-185 + 185 + -8x + x2 = 0 + 185

Combine like terms: -185 + 185 = 0
0 + -8x + x2 = 0 + 185
-8x + x2 = 0 + 185

Combine like terms: 0 + 185 = 185
-8x + x2 = 185

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 185 + 16

Reorder the terms:
16 + -8x + x2 = 185 + 16

Combine like terms: 185 + 16 = 201
16 + -8x + x2 = 201

Factor a perfect square on the left side:
(x + -4)(x + -4) = 201

Calculate the square root of the right side: 14.177446879

Break this problem into two subproblems by setting 
(x + -4) equal to 14.177446879 and -14.177446879.

Subproblem 1

x + -4 = 14.177446879 Simplifying x + -4 = 14.177446879 Reorder the terms: -4 + x = 14.177446879 Solving -4 + x = 14.177446879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 14.177446879 + 4 Combine like terms: -4 + 4 = 0 0 + x = 14.177446879 + 4 x = 14.177446879 + 4 Combine like terms: 14.177446879 + 4 = 18.177446879 x = 18.177446879 Simplifying x = 18.177446879

Subproblem 2

x + -4 = -14.177446879 Simplifying x + -4 = -14.177446879 Reorder the terms: -4 + x = -14.177446879 Solving -4 + x = -14.177446879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -14.177446879 + 4 Combine like terms: -4 + 4 = 0 0 + x = -14.177446879 + 4 x = -14.177446879 + 4 Combine like terms: -14.177446879 + 4 = -10.177446879 x = -10.177446879 Simplifying x = -10.177446879

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.177446879, -10.177446879}

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