x^2+3x=29

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Solution for x^2+3x=29 equation:


Simplifying
x2 + 3x = 29

Reorder the terms:
3x + x2 = 29

Solving
3x + x2 = 29

Solving for variable 'x'.

Reorder the terms:
-29 + 3x + x2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '29' to each side of the equation.
-29 + 3x + 29 + x2 = 0 + 29

Reorder the terms:
-29 + 29 + 3x + x2 = 0 + 29

Combine like terms: -29 + 29 = 0
0 + 3x + x2 = 0 + 29
3x + x2 = 0 + 29

Combine like terms: 0 + 29 = 29
3x + x2 = 29

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 = 29 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 29 + 2.25

Combine like terms: 29 + 2.25 = 31.25
2.25 + 3x + x2 = 31.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 31.25

Calculate the square root of the right side: 5.590169944

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.590169944 and -5.590169944.

Subproblem 1

x + 1.5 = 5.590169944 Simplifying x + 1.5 = 5.590169944 Reorder the terms: 1.5 + x = 5.590169944 Solving 1.5 + x = 5.590169944 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 = 5.590169944 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.590169944 + -1.5 x = 5.590169944 + -1.5 Combine like terms: 5.590169944 + -1.5 = 4.090169944 x = 4.090169944 Simplifying x = 4.090169944

Subproblem 2

x + 1.5 = -5.590169944 Simplifying x + 1.5 = -5.590169944 Reorder the terms: 1.5 + x = -5.590169944 Solving 1.5 + x = -5.590169944 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 = -5.590169944 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.590169944 + -1.5 x = -5.590169944 + -1.5 Combine like terms: -5.590169944 + -1.5 = -7.090169944 x = -7.090169944 Simplifying x = -7.090169944

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.090169944, -7.090169944}

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