5x(2x+1)+(5-9)=0

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Solution for 5x(2x+1)+(5-9)=0 equation:


Simplifying
5x(2x + 1) + (5 + -9) = 0

Reorder the terms:
5x(1 + 2x) + (5 + -9) = 0
(1 * 5x + 2x * 5x) + (5 + -9) = 0
(5x + 10x2) + (5 + -9) = 0

Combine like terms: 5 + -9 = -4
5x + 10x2 + (-4) = 0
5x + 10x2 + -4 = 0

Reorder the terms:
-4 + 5x + 10x2 = 0

Solving
-4 + 5x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.4 + 0.5x + x2 = 0.0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.5x + 0.4 + x2 = 0.0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.5x + x2 = 0.0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.5x + x2 = 0.0 + 0.4
0.5x + x2 = 0.0 + 0.4

Combine like terms: 0.0 + 0.4 = 0.4
0.5x + x2 = 0.4

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 0.4 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 0.4 + 0.0625

Combine like terms: 0.4 + 0.0625 = 0.4625
0.0625 + 0.5x + x2 = 0.4625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.4625

Calculate the square root of the right side: 0.680073525

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.680073525 and -0.680073525.

Subproblem 1

x + 0.25 = 0.680073525 Simplifying x + 0.25 = 0.680073525 Reorder the terms: 0.25 + x = 0.680073525 Solving 0.25 + x = 0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.680073525 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.680073525 + -0.25 x = 0.680073525 + -0.25 Combine like terms: 0.680073525 + -0.25 = 0.430073525 x = 0.430073525 Simplifying x = 0.430073525

Subproblem 2

x + 0.25 = -0.680073525 Simplifying x + 0.25 = -0.680073525 Reorder the terms: 0.25 + x = -0.680073525 Solving 0.25 + x = -0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -0.680073525 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.680073525 + -0.25 x = -0.680073525 + -0.25 Combine like terms: -0.680073525 + -0.25 = -0.930073525 x = -0.930073525 Simplifying x = -0.930073525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.430073525, -0.930073525}

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