(14x+6)(15-12x)=1

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Solution for (14x+6)(15-12x)=1 equation:


Simplifying
(14x + 6)(15 + -12x) = 1

Reorder the terms:
(6 + 14x)(15 + -12x) = 1

Multiply (6 + 14x) * (15 + -12x)
(6(15 + -12x) + 14x * (15 + -12x)) = 1
((15 * 6 + -12x * 6) + 14x * (15 + -12x)) = 1
((90 + -72x) + 14x * (15 + -12x)) = 1
(90 + -72x + (15 * 14x + -12x * 14x)) = 1
(90 + -72x + (210x + -168x2)) = 1

Combine like terms: -72x + 210x = 138x
(90 + 138x + -168x2) = 1

Solving
90 + 138x + -168x2 = 1

Solving for variable 'x'.

Reorder the terms:
90 + -1 + 138x + -168x2 = 1 + -1

Combine like terms: 90 + -1 = 89
89 + 138x + -168x2 = 1 + -1

Combine like terms: 1 + -1 = 0
89 + 138x + -168x2 = 0

Begin completing the square.  Divide all terms by
-168 the coefficient of the squared term: 

Divide each side by '-168'.
-0.5297619048 + -0.8214285714x + x2 = 0

Move the constant term to the right:

Add '0.5297619048' to each side of the equation.
-0.5297619048 + -0.8214285714x + 0.5297619048 + x2 = 0 + 0.5297619048

Reorder the terms:
-0.5297619048 + 0.5297619048 + -0.8214285714x + x2 = 0 + 0.5297619048

Combine like terms: -0.5297619048 + 0.5297619048 = 0.0000000000
0.0000000000 + -0.8214285714x + x2 = 0 + 0.5297619048
-0.8214285714x + x2 = 0 + 0.5297619048

Combine like terms: 0 + 0.5297619048 = 0.5297619048
-0.8214285714x + x2 = 0.5297619048

The x term is -0.8214285714x.  Take half its coefficient (-0.4107142857).
Square it (0.1686862245) and add it to both sides.

Add '0.1686862245' to each side of the equation.
-0.8214285714x + 0.1686862245 + x2 = 0.5297619048 + 0.1686862245

Reorder the terms:
0.1686862245 + -0.8214285714x + x2 = 0.5297619048 + 0.1686862245

Combine like terms: 0.5297619048 + 0.1686862245 = 0.6984481293
0.1686862245 + -0.8214285714x + x2 = 0.6984481293

Factor a perfect square on the left side:
(x + -0.4107142857)(x + -0.4107142857) = 0.6984481293

Calculate the square root of the right side: 0.835732092

Break this problem into two subproblems by setting 
(x + -0.4107142857) equal to 0.835732092 and -0.835732092.

Subproblem 1

x + -0.4107142857 = 0.835732092 Simplifying x + -0.4107142857 = 0.835732092 Reorder the terms: -0.4107142857 + x = 0.835732092 Solving -0.4107142857 + x = 0.835732092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4107142857' to each side of the equation. -0.4107142857 + 0.4107142857 + x = 0.835732092 + 0.4107142857 Combine like terms: -0.4107142857 + 0.4107142857 = 0.0000000000 0.0000000000 + x = 0.835732092 + 0.4107142857 x = 0.835732092 + 0.4107142857 Combine like terms: 0.835732092 + 0.4107142857 = 1.2464463777 x = 1.2464463777 Simplifying x = 1.2464463777

Subproblem 2

x + -0.4107142857 = -0.835732092 Simplifying x + -0.4107142857 = -0.835732092 Reorder the terms: -0.4107142857 + x = -0.835732092 Solving -0.4107142857 + x = -0.835732092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4107142857' to each side of the equation. -0.4107142857 + 0.4107142857 + x = -0.835732092 + 0.4107142857 Combine like terms: -0.4107142857 + 0.4107142857 = 0.0000000000 0.0000000000 + x = -0.835732092 + 0.4107142857 x = -0.835732092 + 0.4107142857 Combine like terms: -0.835732092 + 0.4107142857 = -0.4250178063 x = -0.4250178063 Simplifying x = -0.4250178063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2464463777, -0.4250178063}

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