(6x+7x)(4x+7)+5=2x(8x-5)+16

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Solution for (6x+7x)(4x+7)+5=2x(8x-5)+16 equation:


Simplifying
(6x + 7x)(4x + 7) + 5 = 2x(8x + -5) + 16

Combine like terms: 6x + 7x = 13x
(13x)(4x + 7) + 5 = 2x(8x + -5) + 16

Remove parenthesis around (13x)
13x(4x + 7) + 5 = 2x(8x + -5) + 16

Reorder the terms:
13x(7 + 4x) + 5 = 2x(8x + -5) + 16
(7 * 13x + 4x * 13x) + 5 = 2x(8x + -5) + 16
(91x + 52x2) + 5 = 2x(8x + -5) + 16

Reorder the terms:
5 + 91x + 52x2 = 2x(8x + -5) + 16

Reorder the terms:
5 + 91x + 52x2 = 2x(-5 + 8x) + 16
5 + 91x + 52x2 = (-5 * 2x + 8x * 2x) + 16
5 + 91x + 52x2 = (-10x + 16x2) + 16

Reorder the terms:
5 + 91x + 52x2 = 16 + -10x + 16x2

Solving
5 + 91x + 52x2 = 16 + -10x + 16x2

Solving for variable 'x'.

Reorder the terms:
5 + -16 + 91x + 10x + 52x2 + -16x2 = 16 + -10x + 16x2 + -16 + 10x + -16x2

Combine like terms: 5 + -16 = -11
-11 + 91x + 10x + 52x2 + -16x2 = 16 + -10x + 16x2 + -16 + 10x + -16x2

Combine like terms: 91x + 10x = 101x
-11 + 101x + 52x2 + -16x2 = 16 + -10x + 16x2 + -16 + 10x + -16x2

Combine like terms: 52x2 + -16x2 = 36x2
-11 + 101x + 36x2 = 16 + -10x + 16x2 + -16 + 10x + -16x2

Reorder the terms:
-11 + 101x + 36x2 = 16 + -16 + -10x + 10x + 16x2 + -16x2

Combine like terms: 16 + -16 = 0
-11 + 101x + 36x2 = 0 + -10x + 10x + 16x2 + -16x2
-11 + 101x + 36x2 = -10x + 10x + 16x2 + -16x2

Combine like terms: -10x + 10x = 0
-11 + 101x + 36x2 = 0 + 16x2 + -16x2
-11 + 101x + 36x2 = 16x2 + -16x2

Combine like terms: 16x2 + -16x2 = 0
-11 + 101x + 36x2 = 0

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

Divide each side by '36'.
-0.3055555556 + 2.805555556x + x2 = 0

Move the constant term to the right:

Add '0.3055555556' to each side of the equation.
-0.3055555556 + 2.805555556x + 0.3055555556 + x2 = 0 + 0.3055555556

Reorder the terms:
-0.3055555556 + 0.3055555556 + 2.805555556x + x2 = 0 + 0.3055555556

Combine like terms: -0.3055555556 + 0.3055555556 = 0.0000000000
0.0000000000 + 2.805555556x + x2 = 0 + 0.3055555556
2.805555556x + x2 = 0 + 0.3055555556

Combine like terms: 0 + 0.3055555556 = 0.3055555556
2.805555556x + x2 = 0.3055555556

The x term is 2.805555556x.  Take half its coefficient (1.402777778).
Square it (1.967785494) and add it to both sides.

Add '1.967785494' to each side of the equation.
2.805555556x + 1.967785494 + x2 = 0.3055555556 + 1.967785494

Reorder the terms:
1.967785494 + 2.805555556x + x2 = 0.3055555556 + 1.967785494

Combine like terms: 0.3055555556 + 1.967785494 = 2.2733410496
1.967785494 + 2.805555556x + x2 = 2.2733410496

Factor a perfect square on the left side:
(x + 1.402777778)(x + 1.402777778) = 2.2733410496

Calculate the square root of the right side: 1.507760276

Break this problem into two subproblems by setting 
(x + 1.402777778) equal to 1.507760276 and -1.507760276.

Subproblem 1

x + 1.402777778 = 1.507760276 Simplifying x + 1.402777778 = 1.507760276 Reorder the terms: 1.402777778 + x = 1.507760276 Solving 1.402777778 + x = 1.507760276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.402777778' to each side of the equation. 1.402777778 + -1.402777778 + x = 1.507760276 + -1.402777778 Combine like terms: 1.402777778 + -1.402777778 = 0.000000000 0.000000000 + x = 1.507760276 + -1.402777778 x = 1.507760276 + -1.402777778 Combine like terms: 1.507760276 + -1.402777778 = 0.104982498 x = 0.104982498 Simplifying x = 0.104982498

Subproblem 2

x + 1.402777778 = -1.507760276 Simplifying x + 1.402777778 = -1.507760276 Reorder the terms: 1.402777778 + x = -1.507760276 Solving 1.402777778 + x = -1.507760276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.402777778' to each side of the equation. 1.402777778 + -1.402777778 + x = -1.507760276 + -1.402777778 Combine like terms: 1.402777778 + -1.402777778 = 0.000000000 0.000000000 + x = -1.507760276 + -1.402777778 x = -1.507760276 + -1.402777778 Combine like terms: -1.507760276 + -1.402777778 = -2.910538054 x = -2.910538054 Simplifying x = -2.910538054

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.104982498, -2.910538054}

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