5x(x+1)=46

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Solution for 5x(x+1)=46 equation:


Simplifying
5x(x + 1) = 46

Reorder the terms:
5x(1 + x) = 46
(1 * 5x + x * 5x) = 46
(5x + 5x2) = 46

Solving
5x + 5x2 = 46

Solving for variable 'x'.

Reorder the terms:
-46 + 5x + 5x2 = 46 + -46

Combine like terms: 46 + -46 = 0
-46 + 5x + 5x2 = 0

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

Divide each side by '5'.
-9.2 + x + x2 = 0

Move the constant term to the right:

Add '9.2' to each side of the equation.
-9.2 + x + 9.2 + x2 = 0 + 9.2

Reorder the terms:
-9.2 + 9.2 + x + x2 = 0 + 9.2

Combine like terms: -9.2 + 9.2 = 0.0
0.0 + x + x2 = 0 + 9.2
x + x2 = 0 + 9.2

Combine like terms: 0 + 9.2 = 9.2
x + x2 = 9.2

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

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 9.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 9.2 + 0.25

Combine like terms: 9.2 + 0.25 = 9.45
1.25 + x2 = 9.45

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 9.45

Calculate the square root of the right side: 3.07408523

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.07408523 and -3.07408523.

Subproblem 1

x + 0.5 = 3.07408523 Simplifying x + 0.5 = 3.07408523 Reorder the terms: 0.5 + x = 3.07408523 Solving 0.5 + x = 3.07408523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.07408523 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.07408523 + -0.5 x = 3.07408523 + -0.5 Combine like terms: 3.07408523 + -0.5 = 2.57408523 x = 2.57408523 Simplifying x = 2.57408523

Subproblem 2

x + 0.5 = -3.07408523 Simplifying x + 0.5 = -3.07408523 Reorder the terms: 0.5 + x = -3.07408523 Solving 0.5 + x = -3.07408523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.07408523 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.07408523 + -0.5 x = -3.07408523 + -0.5 Combine like terms: -3.07408523 + -0.5 = -3.57408523 x = -3.57408523 Simplifying x = -3.57408523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.57408523, -3.57408523}

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