(2x+10)(2x-3)=5

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Solution for (2x+10)(2x-3)=5 equation:


Simplifying
(2x + 10)(2x + -3) = 5

Reorder the terms:
(10 + 2x)(2x + -3) = 5

Reorder the terms:
(10 + 2x)(-3 + 2x) = 5

Multiply (10 + 2x) * (-3 + 2x)
(10(-3 + 2x) + 2x * (-3 + 2x)) = 5
((-3 * 10 + 2x * 10) + 2x * (-3 + 2x)) = 5
((-30 + 20x) + 2x * (-3 + 2x)) = 5
(-30 + 20x + (-3 * 2x + 2x * 2x)) = 5
(-30 + 20x + (-6x + 4x2)) = 5

Combine like terms: 20x + -6x = 14x
(-30 + 14x + 4x2) = 5

Solving
-30 + 14x + 4x2 = 5

Solving for variable 'x'.

Reorder the terms:
-30 + -5 + 14x + 4x2 = 5 + -5

Combine like terms: -30 + -5 = -35
-35 + 14x + 4x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-35 + 14x + 4x2 = 0

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

Divide each side by '4'.
-8.75 + 3.5x + x2 = 0

Move the constant term to the right:

Add '8.75' to each side of the equation.
-8.75 + 3.5x + 8.75 + x2 = 0 + 8.75

Reorder the terms:
-8.75 + 8.75 + 3.5x + x2 = 0 + 8.75

Combine like terms: -8.75 + 8.75 = 0.00
0.00 + 3.5x + x2 = 0 + 8.75
3.5x + x2 = 0 + 8.75

Combine like terms: 0 + 8.75 = 8.75
3.5x + x2 = 8.75

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 8.75 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 8.75 + 3.0625

Combine like terms: 8.75 + 3.0625 = 11.8125
3.0625 + 3.5x + x2 = 11.8125

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 11.8125

Calculate the square root of the right side: 3.436931771

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.436931771 and -3.436931771.

Subproblem 1

x + 1.75 = 3.436931771 Simplifying x + 1.75 = 3.436931771 Reorder the terms: 1.75 + x = 3.436931771 Solving 1.75 + x = 3.436931771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 3.436931771 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.436931771 + -1.75 x = 3.436931771 + -1.75 Combine like terms: 3.436931771 + -1.75 = 1.686931771 x = 1.686931771 Simplifying x = 1.686931771

Subproblem 2

x + 1.75 = -3.436931771 Simplifying x + 1.75 = -3.436931771 Reorder the terms: 1.75 + x = -3.436931771 Solving 1.75 + x = -3.436931771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -3.436931771 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.436931771 + -1.75 x = -3.436931771 + -1.75 Combine like terms: -3.436931771 + -1.75 = -5.186931771 x = -5.186931771 Simplifying x = -5.186931771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.686931771, -5.186931771}

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