2x(x+3)=16.625

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Solution for 2x(x+3)=16.625 equation:


Simplifying
2x(x + 3) = 16.625

Reorder the terms:
2x(3 + x) = 16.625
(3 * 2x + x * 2x) = 16.625
(6x + 2x2) = 16.625

Solving
6x + 2x2 = 16.625

Solving for variable 'x'.

Reorder the terms:
-16.625 + 6x + 2x2 = 16.625 + -16.625

Combine like terms: 16.625 + -16.625 = 0.000
-16.625 + 6x + 2x2 = 0.000

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

Divide each side by '2'.
-8.3125 + 3x + x2 = 0.000

Move the constant term to the right:

Add '8.3125' to each side of the equation.
-8.3125 + 3x + 8.3125 + x2 = 0.000 + 8.3125

Reorder the terms:
-8.3125 + 8.3125 + 3x + x2 = 0.000 + 8.3125

Combine like terms: -8.3125 + 8.3125 = 0.0000
0.0000 + 3x + x2 = 0.000 + 8.3125
3x + x2 = 0.000 + 8.3125

Combine like terms: 0.000 + 8.3125 = 8.3125
3x + x2 = 8.3125

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 8.3125 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 8.3125 + 2.25

Combine like terms: 8.3125 + 2.25 = 10.5625
2.25 + 3x + x2 = 10.5625

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 10.5625

Calculate the square root of the right side: 3.25

Break this problem into two subproblems by setting 
(x + 1.5) equal to 3.25 and -3.25.

Subproblem 1

x + 1.5 = 3.25 Simplifying x + 1.5 = 3.25 Reorder the terms: 1.5 + x = 3.25 Solving 1.5 + x = 3.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 3.25 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 3.25 + -1.5 x = 3.25 + -1.5 Combine like terms: 3.25 + -1.5 = 1.75 x = 1.75 Simplifying x = 1.75

Subproblem 2

x + 1.5 = -3.25 Simplifying x + 1.5 = -3.25 Reorder the terms: 1.5 + x = -3.25 Solving 1.5 + x = -3.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -3.25 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -3.25 + -1.5 x = -3.25 + -1.5 Combine like terms: -3.25 + -1.5 = -4.75 x = -4.75 Simplifying x = -4.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.75, -4.75}

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