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

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


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

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

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

Solving
30 = 1x + 0.5x2

Solving for variable 'x'.

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

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

Combine like terms: 0.5x2 + -0.5x2 = 0.0
30 + -1x + -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'.
-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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