x(x+3)=164

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Solution for x(x+3)=164 equation:


Simplifying
x(x + 3) = 164

Reorder the terms:
x(3 + x) = 164
(3 * x + x * x) = 164
(3x + x2) = 164

Solving
3x + x2 = 164

Solving for variable 'x'.

Reorder the terms:
-164 + 3x + x2 = 164 + -164

Combine like terms: 164 + -164 = 0
-164 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '164' to each side of the equation.
-164 + 3x + 164 + x2 = 0 + 164

Reorder the terms:
-164 + 164 + 3x + x2 = 0 + 164

Combine like terms: -164 + 164 = 0
0 + 3x + x2 = 0 + 164
3x + x2 = 0 + 164

Combine like terms: 0 + 164 = 164
3x + x2 = 164

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 = 164 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 164 + 2.25

Combine like terms: 164 + 2.25 = 166.25
2.25 + 3x + x2 = 166.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 166.25

Calculate the square root of the right side: 12.893796958

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.893796958 and -12.893796958.

Subproblem 1

x + 1.5 = 12.893796958 Simplifying x + 1.5 = 12.893796958 Reorder the terms: 1.5 + x = 12.893796958 Solving 1.5 + x = 12.893796958 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 = 12.893796958 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.893796958 + -1.5 x = 12.893796958 + -1.5 Combine like terms: 12.893796958 + -1.5 = 11.393796958 x = 11.393796958 Simplifying x = 11.393796958

Subproblem 2

x + 1.5 = -12.893796958 Simplifying x + 1.5 = -12.893796958 Reorder the terms: 1.5 + x = -12.893796958 Solving 1.5 + x = -12.893796958 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 = -12.893796958 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.893796958 + -1.5 x = -12.893796958 + -1.5 Combine like terms: -12.893796958 + -1.5 = -14.393796958 x = -14.393796958 Simplifying x = -14.393796958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.393796958, -14.393796958}

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