x^2+16x=4

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Solution for x^2+16x=4 equation:


Simplifying
x2 + 16x = 4

Reorder the terms:
16x + x2 = 4

Solving
16x + x2 = 4

Solving for variable 'x'.

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

Combine like terms: 4 + -4 = 0
-4 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 16x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 16x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 16x + x2 = 0 + 4
16x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
16x + x2 = 4

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 4 + 64

Reorder the terms:
64 + 16x + x2 = 4 + 64

Combine like terms: 4 + 64 = 68
64 + 16x + x2 = 68

Factor a perfect square on the left side:
(x + 8)(x + 8) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(x + 8) equal to 8.246211251 and -8.246211251.

Subproblem 1

x + 8 = 8.246211251 Simplifying x + 8 = 8.246211251 Reorder the terms: 8 + x = 8.246211251 Solving 8 + x = 8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 8.246211251 + -8 Combine like terms: 8 + -8 = 0 0 + x = 8.246211251 + -8 x = 8.246211251 + -8 Combine like terms: 8.246211251 + -8 = 0.246211251 x = 0.246211251 Simplifying x = 0.246211251

Subproblem 2

x + 8 = -8.246211251 Simplifying x + 8 = -8.246211251 Reorder the terms: 8 + x = -8.246211251 Solving 8 + x = -8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -8.246211251 + -8 Combine like terms: 8 + -8 = 0 0 + x = -8.246211251 + -8 x = -8.246211251 + -8 Combine like terms: -8.246211251 + -8 = -16.246211251 x = -16.246211251 Simplifying x = -16.246211251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.246211251, -16.246211251}

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