x^2-16x-64=4x+16

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Solution for x^2-16x-64=4x+16 equation:


Simplifying
x2 + -16x + -64 = 4x + 16

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

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

Solving
-64 + -16x + x2 = 16 + 4x

Solving for variable 'x'.

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

Combine like terms: -64 + -16 = -80
-80 + -16x + -4x + x2 = 16 + 4x + -16 + -4x

Combine like terms: -16x + -4x = -20x
-80 + -20x + x2 = 16 + 4x + -16 + -4x

Reorder the terms:
-80 + -20x + x2 = 16 + -16 + 4x + -4x

Combine like terms: 16 + -16 = 0
-80 + -20x + x2 = 0 + 4x + -4x
-80 + -20x + x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-80 + -20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + -20x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + -20x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + -20x + x2 = 0 + 80
-20x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
-20x + x2 = 80

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 80 + 100

Reorder the terms:
100 + -20x + x2 = 80 + 100

Combine like terms: 80 + 100 = 180
100 + -20x + x2 = 180

Factor a perfect square on the left side:
(x + -10)(x + -10) = 180

Calculate the square root of the right side: 13.416407865

Break this problem into two subproblems by setting 
(x + -10) equal to 13.416407865 and -13.416407865.

Subproblem 1

x + -10 = 13.416407865 Simplifying x + -10 = 13.416407865 Reorder the terms: -10 + x = 13.416407865 Solving -10 + x = 13.416407865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 13.416407865 + 10 Combine like terms: -10 + 10 = 0 0 + x = 13.416407865 + 10 x = 13.416407865 + 10 Combine like terms: 13.416407865 + 10 = 23.416407865 x = 23.416407865 Simplifying x = 23.416407865

Subproblem 2

x + -10 = -13.416407865 Simplifying x + -10 = -13.416407865 Reorder the terms: -10 + x = -13.416407865 Solving -10 + x = -13.416407865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -13.416407865 + 10 Combine like terms: -10 + 10 = 0 0 + x = -13.416407865 + 10 x = -13.416407865 + 10 Combine like terms: -13.416407865 + 10 = -3.416407865 x = -3.416407865 Simplifying x = -3.416407865

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.416407865, -3.416407865}

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