(4x+14)(7x-2)=1

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Solution for (4x+14)(7x-2)=1 equation:


Simplifying
(4x + 14)(7x + -2) = 1

Reorder the terms:
(14 + 4x)(7x + -2) = 1

Reorder the terms:
(14 + 4x)(-2 + 7x) = 1

Multiply (14 + 4x) * (-2 + 7x)
(14(-2 + 7x) + 4x * (-2 + 7x)) = 1
((-2 * 14 + 7x * 14) + 4x * (-2 + 7x)) = 1
((-28 + 98x) + 4x * (-2 + 7x)) = 1
(-28 + 98x + (-2 * 4x + 7x * 4x)) = 1
(-28 + 98x + (-8x + 28x2)) = 1

Combine like terms: 98x + -8x = 90x
(-28 + 90x + 28x2) = 1

Solving
-28 + 90x + 28x2 = 1

Solving for variable 'x'.

Reorder the terms:
-28 + -1 + 90x + 28x2 = 1 + -1

Combine like terms: -28 + -1 = -29
-29 + 90x + 28x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-29 + 90x + 28x2 = 0

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

Divide each side by '28'.
-1.035714286 + 3.214285714x + x2 = 0

Move the constant term to the right:

Add '1.035714286' to each side of the equation.
-1.035714286 + 3.214285714x + 1.035714286 + x2 = 0 + 1.035714286

Reorder the terms:
-1.035714286 + 1.035714286 + 3.214285714x + x2 = 0 + 1.035714286

Combine like terms: -1.035714286 + 1.035714286 = 0.000000000
0.000000000 + 3.214285714x + x2 = 0 + 1.035714286
3.214285714x + x2 = 0 + 1.035714286

Combine like terms: 0 + 1.035714286 = 1.035714286
3.214285714x + x2 = 1.035714286

The x term is 3.214285714x.  Take half its coefficient (1.607142857).
Square it (2.582908163) and add it to both sides.

Add '2.582908163' to each side of the equation.
3.214285714x + 2.582908163 + x2 = 1.035714286 + 2.582908163

Reorder the terms:
2.582908163 + 3.214285714x + x2 = 1.035714286 + 2.582908163

Combine like terms: 1.035714286 + 2.582908163 = 3.618622449
2.582908163 + 3.214285714x + x2 = 3.618622449

Factor a perfect square on the left side:
(x + 1.607142857)(x + 1.607142857) = 3.618622449

Calculate the square root of the right side: 1.902267712

Break this problem into two subproblems by setting 
(x + 1.607142857) equal to 1.902267712 and -1.902267712.

Subproblem 1

x + 1.607142857 = 1.902267712 Simplifying x + 1.607142857 = 1.902267712 Reorder the terms: 1.607142857 + x = 1.902267712 Solving 1.607142857 + x = 1.902267712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.607142857' to each side of the equation. 1.607142857 + -1.607142857 + x = 1.902267712 + -1.607142857 Combine like terms: 1.607142857 + -1.607142857 = 0.000000000 0.000000000 + x = 1.902267712 + -1.607142857 x = 1.902267712 + -1.607142857 Combine like terms: 1.902267712 + -1.607142857 = 0.295124855 x = 0.295124855 Simplifying x = 0.295124855

Subproblem 2

x + 1.607142857 = -1.902267712 Simplifying x + 1.607142857 = -1.902267712 Reorder the terms: 1.607142857 + x = -1.902267712 Solving 1.607142857 + x = -1.902267712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.607142857' to each side of the equation. 1.607142857 + -1.607142857 + x = -1.902267712 + -1.607142857 Combine like terms: 1.607142857 + -1.607142857 = 0.000000000 0.000000000 + x = -1.902267712 + -1.607142857 x = -1.902267712 + -1.607142857 Combine like terms: -1.902267712 + -1.607142857 = -3.509410569 x = -3.509410569 Simplifying x = -3.509410569

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.295124855, -3.509410569}

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