(3+x)x=23

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Solution for (3+x)x=23 equation:


Simplifying
(3 + x) * x = 23

Reorder the terms for easier multiplication:
x(3 + x) = 23
(3 * x + x * x) = 23
(3x + x2) = 23

Solving
3x + x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 3x + x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 3x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + 3x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 3x + x2 = 0 + 23
3x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
3x + x2 = 23

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 = 23 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 23 + 2.25

Combine like terms: 23 + 2.25 = 25.25
2.25 + 3x + x2 = 25.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

x + 1.5 = 5.024937811 Simplifying x + 1.5 = 5.024937811 Reorder the terms: 1.5 + x = 5.024937811 Solving 1.5 + x = 5.024937811 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 = 5.024937811 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.024937811 + -1.5 x = 5.024937811 + -1.5 Combine like terms: 5.024937811 + -1.5 = 3.524937811 x = 3.524937811 Simplifying x = 3.524937811

Subproblem 2

x + 1.5 = -5.024937811 Simplifying x + 1.5 = -5.024937811 Reorder the terms: 1.5 + x = -5.024937811 Solving 1.5 + x = -5.024937811 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 = -5.024937811 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.024937811 + -1.5 x = -5.024937811 + -1.5 Combine like terms: -5.024937811 + -1.5 = -6.524937811 x = -6.524937811 Simplifying x = -6.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.524937811, -6.524937811}

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