x(19+2x)=28

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Solution for x(19+2x)=28 equation:


Simplifying
x(19 + 2x) = 28
(19 * x + 2x * x) = 28
(19x + 2x2) = 28

Solving
19x + 2x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 19x + 2x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 19x + 2x2 = 0

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

Divide each side by '2'.
-14 + 9.5x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 9.5x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 9.5x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 9.5x + x2 = 0 + 14
9.5x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
9.5x + x2 = 14

The x term is 9.5x.  Take half its coefficient (4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
9.5x + 22.5625 + x2 = 14 + 22.5625

Reorder the terms:
22.5625 + 9.5x + x2 = 14 + 22.5625

Combine like terms: 14 + 22.5625 = 36.5625
22.5625 + 9.5x + x2 = 36.5625

Factor a perfect square on the left side:
(x + 4.75)(x + 4.75) = 36.5625

Calculate the square root of the right side: 6.046693311

Break this problem into two subproblems by setting 
(x + 4.75) equal to 6.046693311 and -6.046693311.

Subproblem 1

x + 4.75 = 6.046693311 Simplifying x + 4.75 = 6.046693311 Reorder the terms: 4.75 + x = 6.046693311 Solving 4.75 + x = 6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = 6.046693311 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = 6.046693311 + -4.75 x = 6.046693311 + -4.75 Combine like terms: 6.046693311 + -4.75 = 1.296693311 x = 1.296693311 Simplifying x = 1.296693311

Subproblem 2

x + 4.75 = -6.046693311 Simplifying x + 4.75 = -6.046693311 Reorder the terms: 4.75 + x = -6.046693311 Solving 4.75 + x = -6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = -6.046693311 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = -6.046693311 + -4.75 x = -6.046693311 + -4.75 Combine like terms: -6.046693311 + -4.75 = -10.796693311 x = -10.796693311 Simplifying x = -10.796693311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.296693311, -10.796693311}

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