9x^2+60x+13=0

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Solution for 9x^2+60x+13=0 equation:


Simplifying
9x2 + 60x + 13 = 0

Reorder the terms:
13 + 60x + 9x2 = 0

Solving
13 + 60x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
1.444444444 + 6.666666667x + x2 = 0

Move the constant term to the right:

Add '-1.444444444' to each side of the equation.
1.444444444 + 6.666666667x + -1.444444444 + x2 = 0 + -1.444444444

Reorder the terms:
1.444444444 + -1.444444444 + 6.666666667x + x2 = 0 + -1.444444444

Combine like terms: 1.444444444 + -1.444444444 = 0.000000000
0.000000000 + 6.666666667x + x2 = 0 + -1.444444444
6.666666667x + x2 = 0 + -1.444444444

Combine like terms: 0 + -1.444444444 = -1.444444444
6.666666667x + x2 = -1.444444444

The x term is 6.666666667x.  Take half its coefficient (3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
6.666666667x + 11.11111112 + x2 = -1.444444444 + 11.11111112

Reorder the terms:
11.11111112 + 6.666666667x + x2 = -1.444444444 + 11.11111112

Combine like terms: -1.444444444 + 11.11111112 = 9.666666676
11.11111112 + 6.666666667x + x2 = 9.666666676

Factor a perfect square on the left side:
(x + 3.333333334)(x + 3.333333334) = 9.666666676

Calculate the square root of the right side: 3.109126353

Break this problem into two subproblems by setting 
(x + 3.333333334) equal to 3.109126353 and -3.109126353.

Subproblem 1

x + 3.333333334 = 3.109126353 Simplifying x + 3.333333334 = 3.109126353 Reorder the terms: 3.333333334 + x = 3.109126353 Solving 3.333333334 + x = 3.109126353 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = 3.109126353 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = 3.109126353 + -3.333333334 x = 3.109126353 + -3.333333334 Combine like terms: 3.109126353 + -3.333333334 = -0.224206981 x = -0.224206981 Simplifying x = -0.224206981

Subproblem 2

x + 3.333333334 = -3.109126353 Simplifying x + 3.333333334 = -3.109126353 Reorder the terms: 3.333333334 + x = -3.109126353 Solving 3.333333334 + x = -3.109126353 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = -3.109126353 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = -3.109126353 + -3.333333334 x = -3.109126353 + -3.333333334 Combine like terms: -3.109126353 + -3.333333334 = -6.442459687 x = -6.442459687 Simplifying x = -6.442459687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.224206981, -6.442459687}

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