2x(7x+5)=13-3x

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Solution for 2x(7x+5)=13-3x equation:


Simplifying
2x(7x + 5) = 13 + -3x

Reorder the terms:
2x(5 + 7x) = 13 + -3x
(5 * 2x + 7x * 2x) = 13 + -3x
(10x + 14x2) = 13 + -3x

Solving
10x + 14x2 = 13 + -3x

Solving for variable 'x'.

Reorder the terms:
-13 + 10x + 3x + 14x2 = 13 + -3x + -13 + 3x

Combine like terms: 10x + 3x = 13x
-13 + 13x + 14x2 = 13 + -3x + -13 + 3x

Reorder the terms:
-13 + 13x + 14x2 = 13 + -13 + -3x + 3x

Combine like terms: 13 + -13 = 0
-13 + 13x + 14x2 = 0 + -3x + 3x
-13 + 13x + 14x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-13 + 13x + 14x2 = 0

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

Divide each side by '14'.
-0.9285714286 + 0.9285714286x + x2 = 0

Move the constant term to the right:

Add '0.9285714286' to each side of the equation.
-0.9285714286 + 0.9285714286x + 0.9285714286 + x2 = 0 + 0.9285714286

Reorder the terms:
-0.9285714286 + 0.9285714286 + 0.9285714286x + x2 = 0 + 0.9285714286

Combine like terms: -0.9285714286 + 0.9285714286 = 0.0000000000
0.0000000000 + 0.9285714286x + x2 = 0 + 0.9285714286
0.9285714286x + x2 = 0 + 0.9285714286

Combine like terms: 0 + 0.9285714286 = 0.9285714286
0.9285714286x + x2 = 0.9285714286

The x term is 0.9285714286x.  Take half its coefficient (0.4642857143).
Square it (0.2155612245) and add it to both sides.

Add '0.2155612245' to each side of the equation.
0.9285714286x + 0.2155612245 + x2 = 0.9285714286 + 0.2155612245

Reorder the terms:
0.2155612245 + 0.9285714286x + x2 = 0.9285714286 + 0.2155612245

Combine like terms: 0.9285714286 + 0.2155612245 = 1.1441326531
0.2155612245 + 0.9285714286x + x2 = 1.1441326531

Factor a perfect square on the left side:
(x + 0.4642857143)(x + 0.4642857143) = 1.1441326531

Calculate the square root of the right side: 1.069641367

Break this problem into two subproblems by setting 
(x + 0.4642857143) equal to 1.069641367 and -1.069641367.

Subproblem 1

x + 0.4642857143 = 1.069641367 Simplifying x + 0.4642857143 = 1.069641367 Reorder the terms: 0.4642857143 + x = 1.069641367 Solving 0.4642857143 + x = 1.069641367 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4642857143' to each side of the equation. 0.4642857143 + -0.4642857143 + x = 1.069641367 + -0.4642857143 Combine like terms: 0.4642857143 + -0.4642857143 = 0.0000000000 0.0000000000 + x = 1.069641367 + -0.4642857143 x = 1.069641367 + -0.4642857143 Combine like terms: 1.069641367 + -0.4642857143 = 0.6053556527 x = 0.6053556527 Simplifying x = 0.6053556527

Subproblem 2

x + 0.4642857143 = -1.069641367 Simplifying x + 0.4642857143 = -1.069641367 Reorder the terms: 0.4642857143 + x = -1.069641367 Solving 0.4642857143 + x = -1.069641367 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4642857143' to each side of the equation. 0.4642857143 + -0.4642857143 + x = -1.069641367 + -0.4642857143 Combine like terms: 0.4642857143 + -0.4642857143 = 0.0000000000 0.0000000000 + x = -1.069641367 + -0.4642857143 x = -1.069641367 + -0.4642857143 Combine like terms: -1.069641367 + -0.4642857143 = -1.5339270813 x = -1.5339270813 Simplifying x = -1.5339270813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6053556527, -1.5339270813}

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