5x+7x^2=83

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Solution for 5x+7x^2=83 equation:


Simplifying
5x + 7x2 = 83

Solving
5x + 7x2 = 83

Solving for variable 'x'.

Reorder the terms:
-83 + 5x + 7x2 = 83 + -83

Combine like terms: 83 + -83 = 0
-83 + 5x + 7x2 = 0

Begin completing the square.  Divide all terms by
7 the coefficient of the squared term: 

Divide each side by '7'.
-11.85714286 + 0.7142857143x + x2 = 0

Move the constant term to the right:

Add '11.85714286' to each side of the equation.
-11.85714286 + 0.7142857143x + 11.85714286 + x2 = 0 + 11.85714286

Reorder the terms:
-11.85714286 + 11.85714286 + 0.7142857143x + x2 = 0 + 11.85714286

Combine like terms: -11.85714286 + 11.85714286 = 0.00000000
0.00000000 + 0.7142857143x + x2 = 0 + 11.85714286
0.7142857143x + x2 = 0 + 11.85714286

Combine like terms: 0 + 11.85714286 = 11.85714286
0.7142857143x + x2 = 11.85714286

The x term is 0.7142857143x.  Take half its coefficient (0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
0.7142857143x + 0.1275510204 + x2 = 11.85714286 + 0.1275510204

Reorder the terms:
0.1275510204 + 0.7142857143x + x2 = 11.85714286 + 0.1275510204

Combine like terms: 11.85714286 + 0.1275510204 = 11.9846938804
0.1275510204 + 0.7142857143x + x2 = 11.9846938804

Factor a perfect square on the left side:
(x + 0.3571428572)(x + 0.3571428572) = 11.9846938804

Calculate the square root of the right side: 3.461891662

Break this problem into two subproblems by setting 
(x + 0.3571428572) equal to 3.461891662 and -3.461891662.

Subproblem 1

x + 0.3571428572 = 3.461891662 Simplifying x + 0.3571428572 = 3.461891662 Reorder the terms: 0.3571428572 + x = 3.461891662 Solving 0.3571428572 + x = 3.461891662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + x = 3.461891662 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + x = 3.461891662 + -0.3571428572 x = 3.461891662 + -0.3571428572 Combine like terms: 3.461891662 + -0.3571428572 = 3.1047488048 x = 3.1047488048 Simplifying x = 3.1047488048

Subproblem 2

x + 0.3571428572 = -3.461891662 Simplifying x + 0.3571428572 = -3.461891662 Reorder the terms: 0.3571428572 + x = -3.461891662 Solving 0.3571428572 + x = -3.461891662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + x = -3.461891662 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + x = -3.461891662 + -0.3571428572 x = -3.461891662 + -0.3571428572 Combine like terms: -3.461891662 + -0.3571428572 = -3.8190345192 x = -3.8190345192 Simplifying x = -3.8190345192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.1047488048, -3.8190345192}

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