x(x+3)=57

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Solution for x(x+3)=57 equation:


Simplifying
x(x + 3) = 57

Reorder the terms:
x(3 + x) = 57
(3 * x + x * x) = 57
(3x + x2) = 57

Solving
3x + x2 = 57

Solving for variable 'x'.

Reorder the terms:
-57 + 3x + x2 = 57 + -57

Combine like terms: 57 + -57 = 0
-57 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '57' to each side of the equation.
-57 + 3x + 57 + x2 = 0 + 57

Reorder the terms:
-57 + 57 + 3x + x2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + 3x + x2 = 0 + 57
3x + x2 = 0 + 57

Combine like terms: 0 + 57 = 57
3x + x2 = 57

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 = 57 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 57 + 2.25

Combine like terms: 57 + 2.25 = 59.25
2.25 + 3x + x2 = 59.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 59.25

Calculate the square root of the right side: 7.697402159

Break this problem into two subproblems by setting 
(x + 1.5) equal to 7.697402159 and -7.697402159.

Subproblem 1

x + 1.5 = 7.697402159 Simplifying x + 1.5 = 7.697402159 Reorder the terms: 1.5 + x = 7.697402159 Solving 1.5 + x = 7.697402159 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 = 7.697402159 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 7.697402159 + -1.5 x = 7.697402159 + -1.5 Combine like terms: 7.697402159 + -1.5 = 6.197402159 x = 6.197402159 Simplifying x = 6.197402159

Subproblem 2

x + 1.5 = -7.697402159 Simplifying x + 1.5 = -7.697402159 Reorder the terms: 1.5 + x = -7.697402159 Solving 1.5 + x = -7.697402159 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 = -7.697402159 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -7.697402159 + -1.5 x = -7.697402159 + -1.5 Combine like terms: -7.697402159 + -1.5 = -9.197402159 x = -9.197402159 Simplifying x = -9.197402159

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.197402159, -9.197402159}

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