2x(x-5)=19

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Solution for 2x(x-5)=19 equation:


Simplifying
2x(x + -5) = 19

Reorder the terms:
2x(-5 + x) = 19
(-5 * 2x + x * 2x) = 19
(-10x + 2x2) = 19

Solving
-10x + 2x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + -10x + 2x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + -10x + 2x2 = 0

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

Divide each side by '2'.
-9.5 + -5x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -5x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -5x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -5x + x2 = 0 + 9.5
-5x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-5x + x2 = 9.5

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 9.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 9.5 + 6.25

Combine like terms: 9.5 + 6.25 = 15.75
6.25 + -5x + x2 = 15.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 15.75

Calculate the square root of the right side: 3.968626967

Break this problem into two subproblems by setting 
(x + -2.5) equal to 3.968626967 and -3.968626967.

Subproblem 1

x + -2.5 = 3.968626967 Simplifying x + -2.5 = 3.968626967 Reorder the terms: -2.5 + x = 3.968626967 Solving -2.5 + x = 3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 3.968626967 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 3.968626967 + 2.5 x = 3.968626967 + 2.5 Combine like terms: 3.968626967 + 2.5 = 6.468626967 x = 6.468626967 Simplifying x = 6.468626967

Subproblem 2

x + -2.5 = -3.968626967 Simplifying x + -2.5 = -3.968626967 Reorder the terms: -2.5 + x = -3.968626967 Solving -2.5 + x = -3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -3.968626967 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -3.968626967 + 2.5 x = -3.968626967 + 2.5 Combine like terms: -3.968626967 + 2.5 = -1.468626967 x = -1.468626967 Simplifying x = -1.468626967

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.468626967, -1.468626967}

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