(4x-1)(3x+1)=140

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Solution for (4x-1)(3x+1)=140 equation:


Simplifying
(4x + -1)(3x + 1) = 140

Reorder the terms:
(-1 + 4x)(3x + 1) = 140

Reorder the terms:
(-1 + 4x)(1 + 3x) = 140

Multiply (-1 + 4x) * (1 + 3x)
(-1(1 + 3x) + 4x * (1 + 3x)) = 140
((1 * -1 + 3x * -1) + 4x * (1 + 3x)) = 140
((-1 + -3x) + 4x * (1 + 3x)) = 140
(-1 + -3x + (1 * 4x + 3x * 4x)) = 140
(-1 + -3x + (4x + 12x2)) = 140

Combine like terms: -3x + 4x = 1x
(-1 + 1x + 12x2) = 140

Solving
-1 + 1x + 12x2 = 140

Solving for variable 'x'.

Reorder the terms:
-1 + -140 + 1x + 12x2 = 140 + -140

Combine like terms: -1 + -140 = -141
-141 + 1x + 12x2 = 140 + -140

Combine like terms: 140 + -140 = 0
-141 + 1x + 12x2 = 0

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

Divide each side by '12'.
-11.75 + 0.08333333333x + x2 = 0

Move the constant term to the right:

Add '11.75' to each side of the equation.
-11.75 + 0.08333333333x + 11.75 + x2 = 0 + 11.75

Reorder the terms:
-11.75 + 11.75 + 0.08333333333x + x2 = 0 + 11.75

Combine like terms: -11.75 + 11.75 = 0.00
0.00 + 0.08333333333x + x2 = 0 + 11.75
0.08333333333x + x2 = 0 + 11.75

Combine like terms: 0 + 11.75 = 11.75
0.08333333333x + x2 = 11.75

The x term is 0.08333333333x.  Take half its coefficient (0.04166666667).
Square it (0.001736111111) and add it to both sides.

Add '0.001736111111' to each side of the equation.
0.08333333333x + 0.001736111111 + x2 = 11.75 + 0.001736111111

Reorder the terms:
0.001736111111 + 0.08333333333x + x2 = 11.75 + 0.001736111111

Combine like terms: 11.75 + 0.001736111111 = 11.751736111111
0.001736111111 + 0.08333333333x + x2 = 11.751736111111

Factor a perfect square on the left side:
(x + 0.04166666667)(x + 0.04166666667) = 11.751736111111

Calculate the square root of the right side: 3.428080529

Break this problem into two subproblems by setting 
(x + 0.04166666667) equal to 3.428080529 and -3.428080529.

Subproblem 1

x + 0.04166666667 = 3.428080529 Simplifying x + 0.04166666667 = 3.428080529 Reorder the terms: 0.04166666667 + x = 3.428080529 Solving 0.04166666667 + x = 3.428080529 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04166666667' to each side of the equation. 0.04166666667 + -0.04166666667 + x = 3.428080529 + -0.04166666667 Combine like terms: 0.04166666667 + -0.04166666667 = 0.00000000000 0.00000000000 + x = 3.428080529 + -0.04166666667 x = 3.428080529 + -0.04166666667 Combine like terms: 3.428080529 + -0.04166666667 = 3.38641386233 x = 3.38641386233 Simplifying x = 3.38641386233

Subproblem 2

x + 0.04166666667 = -3.428080529 Simplifying x + 0.04166666667 = -3.428080529 Reorder the terms: 0.04166666667 + x = -3.428080529 Solving 0.04166666667 + x = -3.428080529 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04166666667' to each side of the equation. 0.04166666667 + -0.04166666667 + x = -3.428080529 + -0.04166666667 Combine like terms: 0.04166666667 + -0.04166666667 = 0.00000000000 0.00000000000 + x = -3.428080529 + -0.04166666667 x = -3.428080529 + -0.04166666667 Combine like terms: -3.428080529 + -0.04166666667 = -3.46974719567 x = -3.46974719567 Simplifying x = -3.46974719567

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.38641386233, -3.46974719567}

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