3x+(4x+5)2x=23

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Solution for 3x+(4x+5)2x=23 equation:


Simplifying
3x + (4x + 5) * 2x = 23

Reorder the terms:
3x + (5 + 4x) * 2x = 23

Reorder the terms for easier multiplication:
3x + 2x(5 + 4x) = 23
3x + (5 * 2x + 4x * 2x) = 23
3x + (10x + 8x2) = 23

Combine like terms: 3x + 10x = 13x
13x + 8x2 = 23

Solving
13x + 8x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 13x + 8x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 13x + 8x2 = 0

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

Divide each side by '8'.
-2.875 + 1.625x + x2 = 0

Move the constant term to the right:

Add '2.875' to each side of the equation.
-2.875 + 1.625x + 2.875 + x2 = 0 + 2.875

Reorder the terms:
-2.875 + 2.875 + 1.625x + x2 = 0 + 2.875

Combine like terms: -2.875 + 2.875 = 0.000
0.000 + 1.625x + x2 = 0 + 2.875
1.625x + x2 = 0 + 2.875

Combine like terms: 0 + 2.875 = 2.875
1.625x + x2 = 2.875

The x term is 1.625x.  Take half its coefficient (0.8125).
Square it (0.66015625) and add it to both sides.

Add '0.66015625' to each side of the equation.
1.625x + 0.66015625 + x2 = 2.875 + 0.66015625

Reorder the terms:
0.66015625 + 1.625x + x2 = 2.875 + 0.66015625

Combine like terms: 2.875 + 0.66015625 = 3.53515625
0.66015625 + 1.625x + x2 = 3.53515625

Factor a perfect square on the left side:
(x + 0.8125)(x + 0.8125) = 3.53515625

Calculate the square root of the right side: 1.88020112

Break this problem into two subproblems by setting 
(x + 0.8125) equal to 1.88020112 and -1.88020112.

Subproblem 1

x + 0.8125 = 1.88020112 Simplifying x + 0.8125 = 1.88020112 Reorder the terms: 0.8125 + x = 1.88020112 Solving 0.8125 + x = 1.88020112 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8125' to each side of the equation. 0.8125 + -0.8125 + x = 1.88020112 + -0.8125 Combine like terms: 0.8125 + -0.8125 = 0.0000 0.0000 + x = 1.88020112 + -0.8125 x = 1.88020112 + -0.8125 Combine like terms: 1.88020112 + -0.8125 = 1.06770112 x = 1.06770112 Simplifying x = 1.06770112

Subproblem 2

x + 0.8125 = -1.88020112 Simplifying x + 0.8125 = -1.88020112 Reorder the terms: 0.8125 + x = -1.88020112 Solving 0.8125 + x = -1.88020112 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8125' to each side of the equation. 0.8125 + -0.8125 + x = -1.88020112 + -0.8125 Combine like terms: 0.8125 + -0.8125 = 0.0000 0.0000 + x = -1.88020112 + -0.8125 x = -1.88020112 + -0.8125 Combine like terms: -1.88020112 + -0.8125 = -2.69270112 x = -2.69270112 Simplifying x = -2.69270112

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.06770112, -2.69270112}

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