x^2-18=4x-8

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Solution for x^2-18=4x-8 equation:


Simplifying
x2 + -18 = 4x + -8

Reorder the terms:
-18 + x2 = 4x + -8

Reorder the terms:
-18 + x2 = -8 + 4x

Solving
-18 + x2 = -8 + 4x

Solving for variable 'x'.

Reorder the terms:
-18 + 8 + -4x + x2 = -8 + 4x + 8 + -4x

Combine like terms: -18 + 8 = -10
-10 + -4x + x2 = -8 + 4x + 8 + -4x

Reorder the terms:
-10 + -4x + x2 = -8 + 8 + 4x + -4x

Combine like terms: -8 + 8 = 0
-10 + -4x + x2 = 0 + 4x + -4x
-10 + -4x + x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-10 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -4x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -4x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -4x + x2 = 0 + 10
-4x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-4x + x2 = 10

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 = 10 + 4

Reorder the terms:
4 + -4x + x2 = 10 + 4

Combine like terms: 10 + 4 = 14
4 + -4x + x2 = 14

Factor a perfect square on the left side:
(x + -2)(x + -2) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(x + -2) equal to 3.741657387 and -3.741657387.

Subproblem 1

x + -2 = 3.741657387 Simplifying x + -2 = 3.741657387 Reorder the terms: -2 + x = 3.741657387 Solving -2 + x = 3.741657387 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 = 3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.741657387 + 2 x = 3.741657387 + 2 Combine like terms: 3.741657387 + 2 = 5.741657387 x = 5.741657387 Simplifying x = 5.741657387

Subproblem 2

x + -2 = -3.741657387 Simplifying x + -2 = -3.741657387 Reorder the terms: -2 + x = -3.741657387 Solving -2 + x = -3.741657387 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 = -3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.741657387 + 2 x = -3.741657387 + 2 Combine like terms: -3.741657387 + 2 = -1.741657387 x = -1.741657387 Simplifying x = -1.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.741657387, -1.741657387}

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