0.5x(x+1)-1=0.2

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Solution for 0.5x(x+1)-1=0.2 equation:


Simplifying
0.5x(x + 1) + -1 = 0.2

Reorder the terms:
0.5x(1 + x) + -1 = 0.2
(1 * 0.5x + x * 0.5x) + -1 = 0.2
(0.5x + 0.5x2) + -1 = 0.2

Reorder the terms:
-1 + 0.5x + 0.5x2 = 0.2

Solving
-1 + 0.5x + 0.5x2 = 0.2

Solving for variable 'x'.

Reorder the terms:
-1 + -0.2 + 0.5x + 0.5x2 = 0.2 + -0.2

Combine like terms: -1 + -0.2 = -1.2
-1.2 + 0.5x + 0.5x2 = 0.2 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
-1.2 + 0.5x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
-2.4 + x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + x + x2 = 0 + 2.4
x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
x + x2 = 2.4

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 = 2.4 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 2.4 + 0.25

Combine like terms: 2.4 + 0.25 = 2.65
1.25 + x2 = 2.65

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.65

Calculate the square root of the right side: 1.62788206

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.62788206 and -1.62788206.

Subproblem 1

x + 0.5 = 1.62788206 Simplifying x + 0.5 = 1.62788206 Reorder the terms: 0.5 + x = 1.62788206 Solving 0.5 + x = 1.62788206 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 = 1.62788206 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.62788206 + -0.5 x = 1.62788206 + -0.5 Combine like terms: 1.62788206 + -0.5 = 1.12788206 x = 1.12788206 Simplifying x = 1.12788206

Subproblem 2

x + 0.5 = -1.62788206 Simplifying x + 0.5 = -1.62788206 Reorder the terms: 0.5 + x = -1.62788206 Solving 0.5 + x = -1.62788206 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 = -1.62788206 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.62788206 + -0.5 x = -1.62788206 + -0.5 Combine like terms: -1.62788206 + -0.5 = -2.12788206 x = -2.12788206 Simplifying x = -2.12788206

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.12788206, -2.12788206}

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