x+9=4x^2-8x-16

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Solution for x+9=4x^2-8x-16 equation:


Simplifying
x + 9 = 4x2 + -8x + -16

Reorder the terms:
9 + x = 4x2 + -8x + -16

Reorder the terms:
9 + x = -16 + -8x + 4x2

Solving
9 + x = -16 + -8x + 4x2

Solving for variable 'x'.

Reorder the terms:
9 + 16 + x + 8x + -4x2 = -16 + -8x + 4x2 + 16 + 8x + -4x2

Combine like terms: 9 + 16 = 25
25 + x + 8x + -4x2 = -16 + -8x + 4x2 + 16 + 8x + -4x2

Combine like terms: x + 8x = 9x
25 + 9x + -4x2 = -16 + -8x + 4x2 + 16 + 8x + -4x2

Reorder the terms:
25 + 9x + -4x2 = -16 + 16 + -8x + 8x + 4x2 + -4x2

Combine like terms: -16 + 16 = 0
25 + 9x + -4x2 = 0 + -8x + 8x + 4x2 + -4x2
25 + 9x + -4x2 = -8x + 8x + 4x2 + -4x2

Combine like terms: -8x + 8x = 0
25 + 9x + -4x2 = 0 + 4x2 + -4x2
25 + 9x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
25 + 9x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-6.25 + -2.25x + x2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -2.25x + 6.25 + x2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -2.25x + x2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -2.25x + x2 = 0 + 6.25
-2.25x + x2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-2.25x + x2 = 6.25

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = 6.25 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = 6.25 + 1.265625

Combine like terms: 6.25 + 1.265625 = 7.515625
1.265625 + -2.25x + x2 = 7.515625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 7.515625

Calculate the square root of the right side: 2.741464025

Break this problem into two subproblems by setting 
(x + -1.125) equal to 2.741464025 and -2.741464025.

Subproblem 1

x + -1.125 = 2.741464025 Simplifying x + -1.125 = 2.741464025 Reorder the terms: -1.125 + x = 2.741464025 Solving -1.125 + x = 2.741464025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 2.741464025 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 2.741464025 + 1.125 x = 2.741464025 + 1.125 Combine like terms: 2.741464025 + 1.125 = 3.866464025 x = 3.866464025 Simplifying x = 3.866464025

Subproblem 2

x + -1.125 = -2.741464025 Simplifying x + -1.125 = -2.741464025 Reorder the terms: -1.125 + x = -2.741464025 Solving -1.125 + x = -2.741464025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -2.741464025 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -2.741464025 + 1.125 x = -2.741464025 + 1.125 Combine like terms: -2.741464025 + 1.125 = -1.616464025 x = -1.616464025 Simplifying x = -1.616464025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.866464025, -1.616464025}

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