(x-5)(2x+5)=119

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Solution for (x-5)(2x+5)=119 equation:


Simplifying
(x + -5)(2x + 5) = 119

Reorder the terms:
(-5 + x)(2x + 5) = 119

Reorder the terms:
(-5 + x)(5 + 2x) = 119

Multiply (-5 + x) * (5 + 2x)
(-5(5 + 2x) + x(5 + 2x)) = 119
((5 * -5 + 2x * -5) + x(5 + 2x)) = 119
((-25 + -10x) + x(5 + 2x)) = 119
(-25 + -10x + (5 * x + 2x * x)) = 119
(-25 + -10x + (5x + 2x2)) = 119

Combine like terms: -10x + 5x = -5x
(-25 + -5x + 2x2) = 119

Solving
-25 + -5x + 2x2 = 119

Solving for variable 'x'.

Reorder the terms:
-25 + -119 + -5x + 2x2 = 119 + -119

Combine like terms: -25 + -119 = -144
-144 + -5x + 2x2 = 119 + -119

Combine like terms: 119 + -119 = 0
-144 + -5x + 2x2 = 0

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

Divide each side by '2'.
-72 + -2.5x + x2 = 0

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -2.5x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + -2.5x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -2.5x + x2 = 0 + 72
-2.5x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
-2.5x + x2 = 72

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 = 72 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 72 + 1.5625

Combine like terms: 72 + 1.5625 = 73.5625
1.5625 + -2.5x + x2 = 73.5625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 73.5625

Calculate the square root of the right side: 8.576858399

Break this problem into two subproblems by setting 
(x + -1.25) equal to 8.576858399 and -8.576858399.

Subproblem 1

x + -1.25 = 8.576858399 Simplifying x + -1.25 = 8.576858399 Reorder the terms: -1.25 + x = 8.576858399 Solving -1.25 + x = 8.576858399 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 = 8.576858399 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 8.576858399 + 1.25 x = 8.576858399 + 1.25 Combine like terms: 8.576858399 + 1.25 = 9.826858399 x = 9.826858399 Simplifying x = 9.826858399

Subproblem 2

x + -1.25 = -8.576858399 Simplifying x + -1.25 = -8.576858399 Reorder the terms: -1.25 + x = -8.576858399 Solving -1.25 + x = -8.576858399 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 = -8.576858399 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -8.576858399 + 1.25 x = -8.576858399 + 1.25 Combine like terms: -8.576858399 + 1.25 = -7.326858399 x = -7.326858399 Simplifying x = -7.326858399

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.826858399, -7.326858399}

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