x^2+3x-729=0

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Solution for x^2+3x-729=0 equation:


Simplifying
x2 + 3x + -729 = 0

Reorder the terms:
-729 + 3x + x2 = 0

Solving
-729 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '729' to each side of the equation.
-729 + 3x + 729 + x2 = 0 + 729

Reorder the terms:
-729 + 729 + 3x + x2 = 0 + 729

Combine like terms: -729 + 729 = 0
0 + 3x + x2 = 0 + 729
3x + x2 = 0 + 729

Combine like terms: 0 + 729 = 729
3x + x2 = 729

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 = 729 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 729 + 2.25

Combine like terms: 729 + 2.25 = 731.25
2.25 + 3x + x2 = 731.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 731.25

Calculate the square root of the right side: 27.041634566

Break this problem into two subproblems by setting 
(x + 1.5) equal to 27.041634566 and -27.041634566.

Subproblem 1

x + 1.5 = 27.041634566 Simplifying x + 1.5 = 27.041634566 Reorder the terms: 1.5 + x = 27.041634566 Solving 1.5 + x = 27.041634566 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 = 27.041634566 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 27.041634566 + -1.5 x = 27.041634566 + -1.5 Combine like terms: 27.041634566 + -1.5 = 25.541634566 x = 25.541634566 Simplifying x = 25.541634566

Subproblem 2

x + 1.5 = -27.041634566 Simplifying x + 1.5 = -27.041634566 Reorder the terms: 1.5 + x = -27.041634566 Solving 1.5 + x = -27.041634566 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 = -27.041634566 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -27.041634566 + -1.5 x = -27.041634566 + -1.5 Combine like terms: -27.041634566 + -1.5 = -28.541634566 x = -28.541634566 Simplifying x = -28.541634566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.541634566, -28.541634566}

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