2x(5x+3)=111

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Solution for 2x(5x+3)=111 equation:


Simplifying
2x(5x + 3) = 111

Reorder the terms:
2x(3 + 5x) = 111
(3 * 2x + 5x * 2x) = 111
(6x + 10x2) = 111

Solving
6x + 10x2 = 111

Solving for variable 'x'.

Reorder the terms:
-111 + 6x + 10x2 = 111 + -111

Combine like terms: 111 + -111 = 0
-111 + 6x + 10x2 = 0

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

Divide each side by '10'.
-11.1 + 0.6x + x2 = 0.0

Move the constant term to the right:

Add '11.1' to each side of the equation.
-11.1 + 0.6x + 11.1 + x2 = 0.0 + 11.1

Reorder the terms:
-11.1 + 11.1 + 0.6x + x2 = 0.0 + 11.1

Combine like terms: -11.1 + 11.1 = 0.0
0.0 + 0.6x + x2 = 0.0 + 11.1
0.6x + x2 = 0.0 + 11.1

Combine like terms: 0.0 + 11.1 = 11.1
0.6x + x2 = 11.1

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 11.1 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 11.1 + 0.09

Combine like terms: 11.1 + 0.09 = 11.19
0.09 + 0.6x + x2 = 11.19

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 11.19

Calculate the square root of the right side: 3.345145737

Break this problem into two subproblems by setting 
(x + 0.3) equal to 3.345145737 and -3.345145737.

Subproblem 1

x + 0.3 = 3.345145737 Simplifying x + 0.3 = 3.345145737 Reorder the terms: 0.3 + x = 3.345145737 Solving 0.3 + x = 3.345145737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 3.345145737 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 3.345145737 + -0.3 x = 3.345145737 + -0.3 Combine like terms: 3.345145737 + -0.3 = 3.045145737 x = 3.045145737 Simplifying x = 3.045145737

Subproblem 2

x + 0.3 = -3.345145737 Simplifying x + 0.3 = -3.345145737 Reorder the terms: 0.3 + x = -3.345145737 Solving 0.3 + x = -3.345145737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -3.345145737 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -3.345145737 + -0.3 x = -3.345145737 + -0.3 Combine like terms: -3.345145737 + -0.3 = -3.645145737 x = -3.645145737 Simplifying x = -3.645145737

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.045145737, -3.645145737}

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