x^2-4x=4x+25

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


Simplifying
x2 + -4x = 4x + 25

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

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

Solving
-4x + x2 = 25 + 4x

Solving for variable 'x'.

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

Combine like terms: -4x + -4x = -8x
-25 + -8x + x2 = 25 + 4x + -25 + -4x

Reorder the terms:
-25 + -8x + x2 = 25 + -25 + 4x + -4x

Combine like terms: 25 + -25 = 0
-25 + -8x + x2 = 0 + 4x + -4x
-25 + -8x + x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-25 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -8x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -8x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -8x + x2 = 0 + 25
-8x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-8x + x2 = 25

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 = 25 + 16

Reorder the terms:
16 + -8x + x2 = 25 + 16

Combine like terms: 25 + 16 = 41
16 + -8x + x2 = 41

Factor a perfect square on the left side:
(x + -4)(x + -4) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x + -4) equal to 6.403124237 and -6.403124237.

Subproblem 1

x + -4 = 6.403124237 Simplifying x + -4 = 6.403124237 Reorder the terms: -4 + x = 6.403124237 Solving -4 + x = 6.403124237 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 = 6.403124237 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6.403124237 + 4 x = 6.403124237 + 4 Combine like terms: 6.403124237 + 4 = 10.403124237 x = 10.403124237 Simplifying x = 10.403124237

Subproblem 2

x + -4 = -6.403124237 Simplifying x + -4 = -6.403124237 Reorder the terms: -4 + x = -6.403124237 Solving -4 + x = -6.403124237 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 = -6.403124237 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6.403124237 + 4 x = -6.403124237 + 4 Combine like terms: -6.403124237 + 4 = -2.403124237 x = -2.403124237 Simplifying x = -2.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.403124237, -2.403124237}

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