19=x(2x+4)

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Solution for 19=x(2x+4) equation:


Simplifying
19 = x(2x + 4)

Reorder the terms:
19 = x(4 + 2x)
19 = (4 * x + 2x * x)
19 = (4x + 2x2)

Solving
19 = 4x + 2x2

Solving for variable 'x'.

Reorder the terms:
19 + -4x + -2x2 = 4x + -4x + 2x2 + -2x2

Combine like terms: 4x + -4x = 0
19 + -4x + -2x2 = 0 + 2x2 + -2x2
19 + -4x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
19 + -4x + -2x2 = 0

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

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

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + 2x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + 2x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + 2x + x2 = 0 + 9.5
2x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
2x + x2 = 9.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 9.5 + 1

Reorder the terms:
1 + 2x + x2 = 9.5 + 1

Combine like terms: 9.5 + 1 = 10.5
1 + 2x + x2 = 10.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 10.5

Calculate the square root of the right side: 3.240370349

Break this problem into two subproblems by setting 
(x + 1) equal to 3.240370349 and -3.240370349.

Subproblem 1

x + 1 = 3.240370349 Simplifying x + 1 = 3.240370349 Reorder the terms: 1 + x = 3.240370349 Solving 1 + x = 3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.240370349 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.240370349 + -1 x = 3.240370349 + -1 Combine like terms: 3.240370349 + -1 = 2.240370349 x = 2.240370349 Simplifying x = 2.240370349

Subproblem 2

x + 1 = -3.240370349 Simplifying x + 1 = -3.240370349 Reorder the terms: 1 + x = -3.240370349 Solving 1 + x = -3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.240370349 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.240370349 + -1 x = -3.240370349 + -1 Combine like terms: -3.240370349 + -1 = -4.240370349 x = -4.240370349 Simplifying x = -4.240370349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.240370349, -4.240370349}

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