(1x+3)(2x-1)-207=0

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Solution for (1x+3)(2x-1)-207=0 equation:


Simplifying
(1x + 3)(2x + -1) + -207 = 0

Reorder the terms:
(3 + 1x)(2x + -1) + -207 = 0

Reorder the terms:
(3 + 1x)(-1 + 2x) + -207 = 0

Multiply (3 + 1x) * (-1 + 2x)
(3(-1 + 2x) + 1x * (-1 + 2x)) + -207 = 0
((-1 * 3 + 2x * 3) + 1x * (-1 + 2x)) + -207 = 0
((-3 + 6x) + 1x * (-1 + 2x)) + -207 = 0
(-3 + 6x + (-1 * 1x + 2x * 1x)) + -207 = 0
(-3 + 6x + (-1x + 2x2)) + -207 = 0

Combine like terms: 6x + -1x = 5x
(-3 + 5x + 2x2) + -207 = 0

Reorder the terms:
-3 + -207 + 5x + 2x2 = 0

Combine like terms: -3 + -207 = -210
-210 + 5x + 2x2 = 0

Solving
-210 + 5x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-105 + 2.5x + x2 = 0

Move the constant term to the right:

Add '105' to each side of the equation.
-105 + 2.5x + 105 + x2 = 0 + 105

Reorder the terms:
-105 + 105 + 2.5x + x2 = 0 + 105

Combine like terms: -105 + 105 = 0
0 + 2.5x + x2 = 0 + 105
2.5x + x2 = 0 + 105

Combine like terms: 0 + 105 = 105
2.5x + x2 = 105

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 105 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 105 + 1.5625

Combine like terms: 105 + 1.5625 = 106.5625
1.5625 + 2.5x + x2 = 106.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 106.5625

Calculate the square root of the right side: 10.322911411

Break this problem into two subproblems by setting 
(x + 1.25) equal to 10.322911411 and -10.322911411.

Subproblem 1

x + 1.25 = 10.322911411 Simplifying x + 1.25 = 10.322911411 Reorder the terms: 1.25 + x = 10.322911411 Solving 1.25 + x = 10.322911411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 10.322911411 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 10.322911411 + -1.25 x = 10.322911411 + -1.25 Combine like terms: 10.322911411 + -1.25 = 9.072911411 x = 9.072911411 Simplifying x = 9.072911411

Subproblem 2

x + 1.25 = -10.322911411 Simplifying x + 1.25 = -10.322911411 Reorder the terms: 1.25 + x = -10.322911411 Solving 1.25 + x = -10.322911411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -10.322911411 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -10.322911411 + -1.25 x = -10.322911411 + -1.25 Combine like terms: -10.322911411 + -1.25 = -11.572911411 x = -11.572911411 Simplifying x = -11.572911411

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.072911411, -11.572911411}

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