(2x+5)(x-5)=6

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Solution for (2x+5)(x-5)=6 equation:


Simplifying
(2x + 5)(x + -5) = 6

Reorder the terms:
(5 + 2x)(x + -5) = 6

Reorder the terms:
(5 + 2x)(-5 + x) = 6

Multiply (5 + 2x) * (-5 + x)
(5(-5 + x) + 2x * (-5 + x)) = 6
((-5 * 5 + x * 5) + 2x * (-5 + x)) = 6
((-25 + 5x) + 2x * (-5 + x)) = 6
(-25 + 5x + (-5 * 2x + x * 2x)) = 6
(-25 + 5x + (-10x + 2x2)) = 6

Combine like terms: 5x + -10x = -5x
(-25 + -5x + 2x2) = 6

Solving
-25 + -5x + 2x2 = 6

Solving for variable 'x'.

Reorder the terms:
-25 + -6 + -5x + 2x2 = 6 + -6

Combine like terms: -25 + -6 = -31
-31 + -5x + 2x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-31 + -5x + 2x2 = 0

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

Divide each side by '2'.
-15.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '15.5' to each side of the equation.
-15.5 + -2.5x + 15.5 + x2 = 0 + 15.5

Reorder the terms:
-15.5 + 15.5 + -2.5x + x2 = 0 + 15.5

Combine like terms: -15.5 + 15.5 = 0.0
0.0 + -2.5x + x2 = 0 + 15.5
-2.5x + x2 = 0 + 15.5

Combine like terms: 0 + 15.5 = 15.5
-2.5x + x2 = 15.5

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 = 15.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 15.5 + 1.5625

Combine like terms: 15.5 + 1.5625 = 17.0625
1.5625 + -2.5x + x2 = 17.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 17.0625

Calculate the square root of the right side: 4.13067791

Break this problem into two subproblems by setting 
(x + -1.25) equal to 4.13067791 and -4.13067791.

Subproblem 1

x + -1.25 = 4.13067791 Simplifying x + -1.25 = 4.13067791 Reorder the terms: -1.25 + x = 4.13067791 Solving -1.25 + x = 4.13067791 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 = 4.13067791 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 4.13067791 + 1.25 x = 4.13067791 + 1.25 Combine like terms: 4.13067791 + 1.25 = 5.38067791 x = 5.38067791 Simplifying x = 5.38067791

Subproblem 2

x + -1.25 = -4.13067791 Simplifying x + -1.25 = -4.13067791 Reorder the terms: -1.25 + x = -4.13067791 Solving -1.25 + x = -4.13067791 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 = -4.13067791 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -4.13067791 + 1.25 x = -4.13067791 + 1.25 Combine like terms: -4.13067791 + 1.25 = -2.88067791 x = -2.88067791 Simplifying x = -2.88067791

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.38067791, -2.88067791}

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