5x(x+1)=5-2

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


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

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

Combine like terms: 5 + -2 = 3
5x + 5x2 = 3

Solving
5x + 5x2 = 3

Solving for variable 'x'.

Reorder the terms:
-3 + 5x + 5x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 5x + 5x2 = 0

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

Divide each side by '5'.
-0.6 + x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + x + x2 = 0 + 0.6
x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
x + x2 = 0.6

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 = 0.6 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.6 + 0.25

Combine like terms: 0.6 + 0.25 = 0.85
1.25 + x2 = 0.85

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.85

Calculate the square root of the right side: 0.921954446

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.921954446 and -0.921954446.

Subproblem 1

x + 0.5 = 0.921954446 Simplifying x + 0.5 = 0.921954446 Reorder the terms: 0.5 + x = 0.921954446 Solving 0.5 + x = 0.921954446 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 = 0.921954446 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.921954446 + -0.5 x = 0.921954446 + -0.5 Combine like terms: 0.921954446 + -0.5 = 0.421954446 x = 0.421954446 Simplifying x = 0.421954446

Subproblem 2

x + 0.5 = -0.921954446 Simplifying x + 0.5 = -0.921954446 Reorder the terms: 0.5 + x = -0.921954446 Solving 0.5 + x = -0.921954446 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 = -0.921954446 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.921954446 + -0.5 x = -0.921954446 + -0.5 Combine like terms: -0.921954446 + -0.5 = -1.421954446 x = -1.421954446 Simplifying x = -1.421954446

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.421954446, -1.421954446}

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