9x^2-31x-60=0

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Solution for 9x^2-31x-60=0 equation:


Simplifying
9x2 + -31x + -60 = 0

Reorder the terms:
-60 + -31x + 9x2 = 0

Solving
-60 + -31x + 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'.
-6.666666667 + -3.444444444x + x2 = 0

Move the constant term to the right:

Add '6.666666667' to each side of the equation.
-6.666666667 + -3.444444444x + 6.666666667 + x2 = 0 + 6.666666667

Reorder the terms:
-6.666666667 + 6.666666667 + -3.444444444x + x2 = 0 + 6.666666667

Combine like terms: -6.666666667 + 6.666666667 = 0.000000000
0.000000000 + -3.444444444x + x2 = 0 + 6.666666667
-3.444444444x + x2 = 0 + 6.666666667

Combine like terms: 0 + 6.666666667 = 6.666666667
-3.444444444x + x2 = 6.666666667

The x term is -3.444444444x.  Take half its coefficient (-1.722222222).
Square it (2.966049382) and add it to both sides.

Add '2.966049382' to each side of the equation.
-3.444444444x + 2.966049382 + x2 = 6.666666667 + 2.966049382

Reorder the terms:
2.966049382 + -3.444444444x + x2 = 6.666666667 + 2.966049382

Combine like terms: 6.666666667 + 2.966049382 = 9.632716049
2.966049382 + -3.444444444x + x2 = 9.632716049

Factor a perfect square on the left side:
(x + -1.722222222)(x + -1.722222222) = 9.632716049

Calculate the square root of the right side: 3.103661716

Break this problem into two subproblems by setting 
(x + -1.722222222) equal to 3.103661716 and -3.103661716.

Subproblem 1

x + -1.722222222 = 3.103661716 Simplifying x + -1.722222222 = 3.103661716 Reorder the terms: -1.722222222 + x = 3.103661716 Solving -1.722222222 + x = 3.103661716 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.722222222' to each side of the equation. -1.722222222 + 1.722222222 + x = 3.103661716 + 1.722222222 Combine like terms: -1.722222222 + 1.722222222 = 0.000000000 0.000000000 + x = 3.103661716 + 1.722222222 x = 3.103661716 + 1.722222222 Combine like terms: 3.103661716 + 1.722222222 = 4.825883938 x = 4.825883938 Simplifying x = 4.825883938

Subproblem 2

x + -1.722222222 = -3.103661716 Simplifying x + -1.722222222 = -3.103661716 Reorder the terms: -1.722222222 + x = -3.103661716 Solving -1.722222222 + x = -3.103661716 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.722222222' to each side of the equation. -1.722222222 + 1.722222222 + x = -3.103661716 + 1.722222222 Combine like terms: -1.722222222 + 1.722222222 = 0.000000000 0.000000000 + x = -3.103661716 + 1.722222222 x = -3.103661716 + 1.722222222 Combine like terms: -3.103661716 + 1.722222222 = -1.381439494 x = -1.381439494 Simplifying x = -1.381439494

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.825883938, -1.381439494}

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