(2x+6)(4x+7)=6x+13

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Solution for (2x+6)(4x+7)=6x+13 equation:


Simplifying
(2x + 6)(4x + 7) = 6x + 13

Reorder the terms:
(6 + 2x)(4x + 7) = 6x + 13

Reorder the terms:
(6 + 2x)(7 + 4x) = 6x + 13

Multiply (6 + 2x) * (7 + 4x)
(6(7 + 4x) + 2x * (7 + 4x)) = 6x + 13
((7 * 6 + 4x * 6) + 2x * (7 + 4x)) = 6x + 13
((42 + 24x) + 2x * (7 + 4x)) = 6x + 13
(42 + 24x + (7 * 2x + 4x * 2x)) = 6x + 13
(42 + 24x + (14x + 8x2)) = 6x + 13

Combine like terms: 24x + 14x = 38x
(42 + 38x + 8x2) = 6x + 13

Reorder the terms:
42 + 38x + 8x2 = 13 + 6x

Solving
42 + 38x + 8x2 = 13 + 6x

Solving for variable 'x'.

Reorder the terms:
42 + -13 + 38x + -6x + 8x2 = 13 + 6x + -13 + -6x

Combine like terms: 42 + -13 = 29
29 + 38x + -6x + 8x2 = 13 + 6x + -13 + -6x

Combine like terms: 38x + -6x = 32x
29 + 32x + 8x2 = 13 + 6x + -13 + -6x

Reorder the terms:
29 + 32x + 8x2 = 13 + -13 + 6x + -6x

Combine like terms: 13 + -13 = 0
29 + 32x + 8x2 = 0 + 6x + -6x
29 + 32x + 8x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
29 + 32x + 8x2 = 0

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

Divide each side by '8'.
3.625 + 4x + x2 = 0

Move the constant term to the right:

Add '-3.625' to each side of the equation.
3.625 + 4x + -3.625 + x2 = 0 + -3.625

Reorder the terms:
3.625 + -3.625 + 4x + x2 = 0 + -3.625

Combine like terms: 3.625 + -3.625 = 0.000
0.000 + 4x + x2 = 0 + -3.625
4x + x2 = 0 + -3.625

Combine like terms: 0 + -3.625 = -3.625
4x + x2 = -3.625

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -3.625 + 4

Reorder the terms:
4 + 4x + x2 = -3.625 + 4

Combine like terms: -3.625 + 4 = 0.375
4 + 4x + x2 = 0.375

Factor a perfect square on the left side:
(x + 2)(x + 2) = 0.375

Calculate the square root of the right side: 0.612372436

Break this problem into two subproblems by setting 
(x + 2) equal to 0.612372436 and -0.612372436.

Subproblem 1

x + 2 = 0.612372436 Simplifying x + 2 = 0.612372436 Reorder the terms: 2 + x = 0.612372436 Solving 2 + x = 0.612372436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0.612372436 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0.612372436 + -2 x = 0.612372436 + -2 Combine like terms: 0.612372436 + -2 = -1.387627564 x = -1.387627564 Simplifying x = -1.387627564

Subproblem 2

x + 2 = -0.612372436 Simplifying x + 2 = -0.612372436 Reorder the terms: 2 + x = -0.612372436 Solving 2 + x = -0.612372436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -0.612372436 + -2 Combine like terms: 2 + -2 = 0 0 + x = -0.612372436 + -2 x = -0.612372436 + -2 Combine like terms: -0.612372436 + -2 = -2.612372436 x = -2.612372436 Simplifying x = -2.612372436

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.387627564, -2.612372436}

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