41=5x(2x+3)

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Solution for 41=5x(2x+3) equation:


Simplifying
41 = 5x(2x + 3)

Reorder the terms:
41 = 5x(3 + 2x)
41 = (3 * 5x + 2x * 5x)
41 = (15x + 10x2)

Solving
41 = 15x + 10x2

Solving for variable 'x'.

Reorder the terms:
41 + -15x + -10x2 = 15x + -15x + 10x2 + -10x2

Combine like terms: 15x + -15x = 0
41 + -15x + -10x2 = 0 + 10x2 + -10x2
41 + -15x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
41 + -15x + -10x2 = 0

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

Divide each side by '-10'.
-4.1 + 1.5x + x2 = 0

Move the constant term to the right:

Add '4.1' to each side of the equation.
-4.1 + 1.5x + 4.1 + x2 = 0 + 4.1

Reorder the terms:
-4.1 + 4.1 + 1.5x + x2 = 0 + 4.1

Combine like terms: -4.1 + 4.1 = 0.0
0.0 + 1.5x + x2 = 0 + 4.1
1.5x + x2 = 0 + 4.1

Combine like terms: 0 + 4.1 = 4.1
1.5x + x2 = 4.1

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 4.1 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 4.1 + 0.5625

Combine like terms: 4.1 + 0.5625 = 4.6625
0.5625 + 1.5x + x2 = 4.6625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 4.6625

Calculate the square root of the right side: 2.159282288

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.159282288 and -2.159282288.

Subproblem 1

x + 0.75 = 2.159282288 Simplifying x + 0.75 = 2.159282288 Reorder the terms: 0.75 + x = 2.159282288 Solving 0.75 + x = 2.159282288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.159282288 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.159282288 + -0.75 x = 2.159282288 + -0.75 Combine like terms: 2.159282288 + -0.75 = 1.409282288 x = 1.409282288 Simplifying x = 1.409282288

Subproblem 2

x + 0.75 = -2.159282288 Simplifying x + 0.75 = -2.159282288 Reorder the terms: 0.75 + x = -2.159282288 Solving 0.75 + x = -2.159282288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.159282288 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.159282288 + -0.75 x = -2.159282288 + -0.75 Combine like terms: -2.159282288 + -0.75 = -2.909282288 x = -2.909282288 Simplifying x = -2.909282288

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.409282288, -2.909282288}

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