3x+x^2=83

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Solution for 3x+x^2=83 equation:


Simplifying
3x + x2 = 83

Solving
3x + x2 = 83

Solving for variable 'x'.

Reorder the terms:
-83 + 3x + x2 = 83 + -83

Combine like terms: 83 + -83 = 0
-83 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '83' to each side of the equation.
-83 + 3x + 83 + x2 = 0 + 83

Reorder the terms:
-83 + 83 + 3x + x2 = 0 + 83

Combine like terms: -83 + 83 = 0
0 + 3x + x2 = 0 + 83
3x + x2 = 0 + 83

Combine like terms: 0 + 83 = 83
3x + x2 = 83

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 = 83 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 83 + 2.25

Combine like terms: 83 + 2.25 = 85.25
2.25 + 3x + x2 = 85.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 85.25

Calculate the square root of the right side: 9.233092656

Break this problem into two subproblems by setting 
(x + 1.5) equal to 9.233092656 and -9.233092656.

Subproblem 1

x + 1.5 = 9.233092656 Simplifying x + 1.5 = 9.233092656 Reorder the terms: 1.5 + x = 9.233092656 Solving 1.5 + x = 9.233092656 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 = 9.233092656 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 9.233092656 + -1.5 x = 9.233092656 + -1.5 Combine like terms: 9.233092656 + -1.5 = 7.733092656 x = 7.733092656 Simplifying x = 7.733092656

Subproblem 2

x + 1.5 = -9.233092656 Simplifying x + 1.5 = -9.233092656 Reorder the terms: 1.5 + x = -9.233092656 Solving 1.5 + x = -9.233092656 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 = -9.233092656 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -9.233092656 + -1.5 x = -9.233092656 + -1.5 Combine like terms: -9.233092656 + -1.5 = -10.733092656 x = -10.733092656 Simplifying x = -10.733092656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.733092656, -10.733092656}

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