.5(x+2)(x)=30

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Solution for .5(x+2)(x)=30 equation:


Simplifying
0.5(x + 2)(x) = 30

Reorder the terms:
0.5(2 + x)(x) = 30

Reorder the terms for easier multiplication:
0.5x(2 + x) = 30
(2 * 0.5x + x * 0.5x) = 30
(1x + 0.5x2) = 30

Solving
1x + 0.5x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + 1x + 0.5x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 1x + 0.5x2 = 0

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

Divide each side by '0.5'.
-60 + 2x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 2x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 2x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 2x + x2 = 0 + 60
2x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
2x + x2 = 60

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 60 + 1

Reorder the terms:
1 + 2x + x2 = 60 + 1

Combine like terms: 60 + 1 = 61
1 + 2x + x2 = 61

Factor a perfect square on the left side:
(x + 1)(x + 1) = 61

Calculate the square root of the right side: 7.810249676

Break this problem into two subproblems by setting 
(x + 1) equal to 7.810249676 and -7.810249676.

Subproblem 1

x + 1 = 7.810249676 Simplifying x + 1 = 7.810249676 Reorder the terms: 1 + x = 7.810249676 Solving 1 + x = 7.810249676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + x = 7.810249676 + -1 x = 7.810249676 + -1 Combine like terms: 7.810249676 + -1 = 6.810249676 x = 6.810249676 Simplifying x = 6.810249676

Subproblem 2

x + 1 = -7.810249676 Simplifying x + 1 = -7.810249676 Reorder the terms: 1 + x = -7.810249676 Solving 1 + x = -7.810249676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + x = -7.810249676 + -1 x = -7.810249676 + -1 Combine like terms: -7.810249676 + -1 = -8.810249676 x = -8.810249676 Simplifying x = -8.810249676

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.810249676, -8.810249676}

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