2x(x+3)=11

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Solution for 2x(x+3)=11 equation:


Simplifying
2x(x + 3) = 11

Reorder the terms:
2x(3 + x) = 11
(3 * 2x + x * 2x) = 11
(6x + 2x2) = 11

Solving
6x + 2x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 6x + 2x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 6x + 2x2 = 0

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

Divide each side by '2'.
-5.5 + 3x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 3x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 3x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 3x + x2 = 0 + 5.5
3x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
3x + x2 = 5.5

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 = 5.5 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 5.5 + 2.25

Combine like terms: 5.5 + 2.25 = 7.75
2.25 + 3x + x2 = 7.75

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

x + 1.5 = 2.783882181 Simplifying x + 1.5 = 2.783882181 Reorder the terms: 1.5 + x = 2.783882181 Solving 1.5 + x = 2.783882181 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 = 2.783882181 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 2.783882181 + -1.5 x = 2.783882181 + -1.5 Combine like terms: 2.783882181 + -1.5 = 1.283882181 x = 1.283882181 Simplifying x = 1.283882181

Subproblem 2

x + 1.5 = -2.783882181 Simplifying x + 1.5 = -2.783882181 Reorder the terms: 1.5 + x = -2.783882181 Solving 1.5 + x = -2.783882181 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 = -2.783882181 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -2.783882181 + -1.5 x = -2.783882181 + -1.5 Combine like terms: -2.783882181 + -1.5 = -4.283882181 x = -4.283882181 Simplifying x = -4.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.283882181, -4.283882181}

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