(x^2)+(8x)=4

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Solution for (x^2)+(8x)=4 equation:


Simplifying
(x2) + (8x) = 4
x2 + (8x) = 4

Reorder the terms:
(8x) + x2 = 4

Solving
(8x) + x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + (8x) + x2 = 4 + -4

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

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + (8x) + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + (8x) + x2 = 0 + 4

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

Combine like terms: 0 + 4 = 4
(8x) + x2 = 4

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 = 4 + 16

Reorder the terms:
16 + (8x) + x2 = 4 + 16

Combine like terms: 4 + 16 = 20
16 + (8x) + x2 = 20

Factor a perfect square on the left side:
(x + 4)(x + 4) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 4) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + 4 = 4.472135955 Simplifying x + 4 = 4.472135955 Reorder the terms: 4 + x = 4.472135955 Solving 4 + x = 4.472135955 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 = 4.472135955 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.472135955 + -4 x = 4.472135955 + -4 Combine like terms: 4.472135955 + -4 = 0.472135955 x = 0.472135955 Simplifying x = 0.472135955

Subproblem 2

x + 4 = -4.472135955 Simplifying x + 4 = -4.472135955 Reorder the terms: 4 + x = -4.472135955 Solving 4 + x = -4.472135955 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 = -4.472135955 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.472135955 + -4 x = -4.472135955 + -4 Combine like terms: -4.472135955 + -4 = -8.472135955 x = -8.472135955 Simplifying x = -8.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.472135955, -8.472135955}

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