(2x+19)(x+7)=86

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Solution for (2x+19)(x+7)=86 equation:


Simplifying
(2x + 19)(x + 7) = 86

Reorder the terms:
(19 + 2x)(x + 7) = 86

Reorder the terms:
(19 + 2x)(7 + x) = 86

Multiply (19 + 2x) * (7 + x)
(19(7 + x) + 2x * (7 + x)) = 86
((7 * 19 + x * 19) + 2x * (7 + x)) = 86
((133 + 19x) + 2x * (7 + x)) = 86
(133 + 19x + (7 * 2x + x * 2x)) = 86
(133 + 19x + (14x + 2x2)) = 86

Combine like terms: 19x + 14x = 33x
(133 + 33x + 2x2) = 86

Solving
133 + 33x + 2x2 = 86

Solving for variable 'x'.

Reorder the terms:
133 + -86 + 33x + 2x2 = 86 + -86

Combine like terms: 133 + -86 = 47
47 + 33x + 2x2 = 86 + -86

Combine like terms: 86 + -86 = 0
47 + 33x + 2x2 = 0

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

Divide each side by '2'.
23.5 + 16.5x + x2 = 0

Move the constant term to the right:

Add '-23.5' to each side of the equation.
23.5 + 16.5x + -23.5 + x2 = 0 + -23.5

Reorder the terms:
23.5 + -23.5 + 16.5x + x2 = 0 + -23.5

Combine like terms: 23.5 + -23.5 = 0.0
0.0 + 16.5x + x2 = 0 + -23.5
16.5x + x2 = 0 + -23.5

Combine like terms: 0 + -23.5 = -23.5
16.5x + x2 = -23.5

The x term is 16.5x.  Take half its coefficient (8.25).
Square it (68.0625) and add it to both sides.

Add '68.0625' to each side of the equation.
16.5x + 68.0625 + x2 = -23.5 + 68.0625

Reorder the terms:
68.0625 + 16.5x + x2 = -23.5 + 68.0625

Combine like terms: -23.5 + 68.0625 = 44.5625
68.0625 + 16.5x + x2 = 44.5625

Factor a perfect square on the left side:
(x + 8.25)(x + 8.25) = 44.5625

Calculate the square root of the right side: 6.675514961

Break this problem into two subproblems by setting 
(x + 8.25) equal to 6.675514961 and -6.675514961.

Subproblem 1

x + 8.25 = 6.675514961 Simplifying x + 8.25 = 6.675514961 Reorder the terms: 8.25 + x = 6.675514961 Solving 8.25 + x = 6.675514961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.25' to each side of the equation. 8.25 + -8.25 + x = 6.675514961 + -8.25 Combine like terms: 8.25 + -8.25 = 0.00 0.00 + x = 6.675514961 + -8.25 x = 6.675514961 + -8.25 Combine like terms: 6.675514961 + -8.25 = -1.574485039 x = -1.574485039 Simplifying x = -1.574485039

Subproblem 2

x + 8.25 = -6.675514961 Simplifying x + 8.25 = -6.675514961 Reorder the terms: 8.25 + x = -6.675514961 Solving 8.25 + x = -6.675514961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.25' to each side of the equation. 8.25 + -8.25 + x = -6.675514961 + -8.25 Combine like terms: 8.25 + -8.25 = 0.00 0.00 + x = -6.675514961 + -8.25 x = -6.675514961 + -8.25 Combine like terms: -6.675514961 + -8.25 = -14.925514961 x = -14.925514961 Simplifying x = -14.925514961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.574485039, -14.925514961}

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