x^2+3x=459

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Solution for x^2+3x=459 equation:


Simplifying
x2 + 3x = 459

Reorder the terms:
3x + x2 = 459

Solving
3x + x2 = 459

Solving for variable 'x'.

Reorder the terms:
-459 + 3x + x2 = 459 + -459

Combine like terms: 459 + -459 = 0
-459 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '459' to each side of the equation.
-459 + 3x + 459 + x2 = 0 + 459

Reorder the terms:
-459 + 459 + 3x + x2 = 0 + 459

Combine like terms: -459 + 459 = 0
0 + 3x + x2 = 0 + 459
3x + x2 = 0 + 459

Combine like terms: 0 + 459 = 459
3x + x2 = 459

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 = 459 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 459 + 2.25

Combine like terms: 459 + 2.25 = 461.25
2.25 + 3x + x2 = 461.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 461.25

Calculate the square root of the right side: 21.476731595

Break this problem into two subproblems by setting 
(x + 1.5) equal to 21.476731595 and -21.476731595.

Subproblem 1

x + 1.5 = 21.476731595 Simplifying x + 1.5 = 21.476731595 Reorder the terms: 1.5 + x = 21.476731595 Solving 1.5 + x = 21.476731595 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 = 21.476731595 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 21.476731595 + -1.5 x = 21.476731595 + -1.5 Combine like terms: 21.476731595 + -1.5 = 19.976731595 x = 19.976731595 Simplifying x = 19.976731595

Subproblem 2

x + 1.5 = -21.476731595 Simplifying x + 1.5 = -21.476731595 Reorder the terms: 1.5 + x = -21.476731595 Solving 1.5 + x = -21.476731595 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 = -21.476731595 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -21.476731595 + -1.5 x = -21.476731595 + -1.5 Combine like terms: -21.476731595 + -1.5 = -22.976731595 x = -22.976731595 Simplifying x = -22.976731595

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.976731595, -22.976731595}

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