3x+x^2=61

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Solution for 3x+x^2=61 equation:


Simplifying
3x + x2 = 61

Solving
3x + x2 = 61

Solving for variable 'x'.

Reorder the terms:
-61 + 3x + x2 = 61 + -61

Combine like terms: 61 + -61 = 0
-61 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '61' to each side of the equation.
-61 + 3x + 61 + x2 = 0 + 61

Reorder the terms:
-61 + 61 + 3x + x2 = 0 + 61

Combine like terms: -61 + 61 = 0
0 + 3x + x2 = 0 + 61
3x + x2 = 0 + 61

Combine like terms: 0 + 61 = 61
3x + x2 = 61

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 = 61 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 61 + 2.25

Combine like terms: 61 + 2.25 = 63.25
2.25 + 3x + x2 = 63.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 63.25

Calculate the square root of the right side: 7.95298686

Break this problem into two subproblems by setting 
(x + 1.5) equal to 7.95298686 and -7.95298686.

Subproblem 1

x + 1.5 = 7.95298686 Simplifying x + 1.5 = 7.95298686 Reorder the terms: 1.5 + x = 7.95298686 Solving 1.5 + x = 7.95298686 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 = 7.95298686 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 7.95298686 + -1.5 x = 7.95298686 + -1.5 Combine like terms: 7.95298686 + -1.5 = 6.45298686 x = 6.45298686 Simplifying x = 6.45298686

Subproblem 2

x + 1.5 = -7.95298686 Simplifying x + 1.5 = -7.95298686 Reorder the terms: 1.5 + x = -7.95298686 Solving 1.5 + x = -7.95298686 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 = -7.95298686 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -7.95298686 + -1.5 x = -7.95298686 + -1.5 Combine like terms: -7.95298686 + -1.5 = -9.45298686 x = -9.45298686 Simplifying x = -9.45298686

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.45298686, -9.45298686}

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