59=x(x+3)

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Solution for 59=x(x+3) equation:


Simplifying
59 = x(x + 3)

Reorder the terms:
59 = x(3 + x)
59 = (3 * x + x * x)
59 = (3x + x2)

Solving
59 = 3x + x2

Solving for variable 'x'.

Reorder the terms:
59 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
59 + -3x + -1x2 = 0 + x2 + -1x2
59 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
59 + -3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-59 + 3x + x2 = 0

Move the constant term to the right:

Add '59' to each side of the equation.
-59 + 3x + 59 + x2 = 0 + 59

Reorder the terms:
-59 + 59 + 3x + x2 = 0 + 59

Combine like terms: -59 + 59 = 0
0 + 3x + x2 = 0 + 59
3x + x2 = 0 + 59

Combine like terms: 0 + 59 = 59
3x + x2 = 59

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 = 59 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 59 + 2.25

Combine like terms: 59 + 2.25 = 61.25
2.25 + 3x + x2 = 61.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 61.25

Calculate the square root of the right side: 7.826237921

Break this problem into two subproblems by setting 
(x + 1.5) equal to 7.826237921 and -7.826237921.

Subproblem 1

x + 1.5 = 7.826237921 Simplifying x + 1.5 = 7.826237921 Reorder the terms: 1.5 + x = 7.826237921 Solving 1.5 + x = 7.826237921 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 = 7.826237921 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 7.826237921 + -1.5 x = 7.826237921 + -1.5 Combine like terms: 7.826237921 + -1.5 = 6.326237921 x = 6.326237921 Simplifying x = 6.326237921

Subproblem 2

x + 1.5 = -7.826237921 Simplifying x + 1.5 = -7.826237921 Reorder the terms: 1.5 + x = -7.826237921 Solving 1.5 + x = -7.826237921 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 = -7.826237921 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -7.826237921 + -1.5 x = -7.826237921 + -1.5 Combine like terms: -7.826237921 + -1.5 = -9.326237921 x = -9.326237921 Simplifying x = -9.326237921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.326237921, -9.326237921}

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