4x(7x+2)=23

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Solution for 4x(7x+2)=23 equation:


Simplifying
4x(7x + 2) = 23

Reorder the terms:
4x(2 + 7x) = 23
(2 * 4x + 7x * 4x) = 23
(8x + 28x2) = 23

Solving
8x + 28x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 8x + 28x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 8x + 28x2 = 0

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

Divide each side by '28'.
-0.8214285714 + 0.2857142857x + x2 = 0

Move the constant term to the right:

Add '0.8214285714' to each side of the equation.
-0.8214285714 + 0.2857142857x + 0.8214285714 + x2 = 0 + 0.8214285714

Reorder the terms:
-0.8214285714 + 0.8214285714 + 0.2857142857x + x2 = 0 + 0.8214285714

Combine like terms: -0.8214285714 + 0.8214285714 = 0.0000000000
0.0000000000 + 0.2857142857x + x2 = 0 + 0.8214285714
0.2857142857x + x2 = 0 + 0.8214285714

Combine like terms: 0 + 0.8214285714 = 0.8214285714
0.2857142857x + x2 = 0.8214285714

The x term is 0.2857142857x.  Take half its coefficient (0.1428571429).
Square it (0.02040816328) and add it to both sides.

Add '0.02040816328' to each side of the equation.
0.2857142857x + 0.02040816328 + x2 = 0.8214285714 + 0.02040816328

Reorder the terms:
0.02040816328 + 0.2857142857x + x2 = 0.8214285714 + 0.02040816328

Combine like terms: 0.8214285714 + 0.02040816328 = 0.84183673468
0.02040816328 + 0.2857142857x + x2 = 0.84183673468

Factor a perfect square on the left side:
(x + 0.1428571429)(x + 0.1428571429) = 0.84183673468

Calculate the square root of the right side: 0.917516613

Break this problem into two subproblems by setting 
(x + 0.1428571429) equal to 0.917516613 and -0.917516613.

Subproblem 1

x + 0.1428571429 = 0.917516613 Simplifying x + 0.1428571429 = 0.917516613 Reorder the terms: 0.1428571429 + x = 0.917516613 Solving 0.1428571429 + x = 0.917516613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = 0.917516613 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = 0.917516613 + -0.1428571429 x = 0.917516613 + -0.1428571429 Combine like terms: 0.917516613 + -0.1428571429 = 0.7746594701 x = 0.7746594701 Simplifying x = 0.7746594701

Subproblem 2

x + 0.1428571429 = -0.917516613 Simplifying x + 0.1428571429 = -0.917516613 Reorder the terms: 0.1428571429 + x = -0.917516613 Solving 0.1428571429 + x = -0.917516613 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = -0.917516613 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = -0.917516613 + -0.1428571429 x = -0.917516613 + -0.1428571429 Combine like terms: -0.917516613 + -0.1428571429 = -1.0603737559 x = -1.0603737559 Simplifying x = -1.0603737559

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7746594701, -1.0603737559}

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