9x^2-61x-60=0

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Solution for 9x^2-61x-60=0 equation:


Simplifying
9x2 + -61x + -60 = 0

Reorder the terms:
-60 + -61x + 9x2 = 0

Solving
-60 + -61x + 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 + -6.777777778x + x2 = 0

Move the constant term to the right:

Add '6.666666667' to each side of the equation.
-6.666666667 + -6.777777778x + 6.666666667 + x2 = 0 + 6.666666667

Reorder the terms:
-6.666666667 + 6.666666667 + -6.777777778x + x2 = 0 + 6.666666667

Combine like terms: -6.666666667 + 6.666666667 = 0.000000000
0.000000000 + -6.777777778x + x2 = 0 + 6.666666667
-6.777777778x + x2 = 0 + 6.666666667

Combine like terms: 0 + 6.666666667 = 6.666666667
-6.777777778x + x2 = 6.666666667

The x term is -6.777777778x.  Take half its coefficient (-3.388888889).
Square it (11.48456790) and add it to both sides.

Add '11.48456790' to each side of the equation.
-6.777777778x + 11.48456790 + x2 = 6.666666667 + 11.48456790

Reorder the terms:
11.48456790 + -6.777777778x + x2 = 6.666666667 + 11.48456790

Combine like terms: 6.666666667 + 11.48456790 = 18.151234567
11.48456790 + -6.777777778x + x2 = 18.151234567

Factor a perfect square on the left side:
(x + -3.388888889)(x + -3.388888889) = 18.151234567

Calculate the square root of the right side: 4.260426571

Break this problem into two subproblems by setting 
(x + -3.388888889) equal to 4.260426571 and -4.260426571.

Subproblem 1

x + -3.388888889 = 4.260426571 Simplifying x + -3.388888889 = 4.260426571 Reorder the terms: -3.388888889 + x = 4.260426571 Solving -3.388888889 + x = 4.260426571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.388888889' to each side of the equation. -3.388888889 + 3.388888889 + x = 4.260426571 + 3.388888889 Combine like terms: -3.388888889 + 3.388888889 = 0.000000000 0.000000000 + x = 4.260426571 + 3.388888889 x = 4.260426571 + 3.388888889 Combine like terms: 4.260426571 + 3.388888889 = 7.64931546 x = 7.64931546 Simplifying x = 7.64931546

Subproblem 2

x + -3.388888889 = -4.260426571 Simplifying x + -3.388888889 = -4.260426571 Reorder the terms: -3.388888889 + x = -4.260426571 Solving -3.388888889 + x = -4.260426571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.388888889' to each side of the equation. -3.388888889 + 3.388888889 + x = -4.260426571 + 3.388888889 Combine like terms: -3.388888889 + 3.388888889 = 0.000000000 0.000000000 + x = -4.260426571 + 3.388888889 x = -4.260426571 + 3.388888889 Combine like terms: -4.260426571 + 3.388888889 = -0.871537682 x = -0.871537682 Simplifying x = -0.871537682

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.64931546, -0.871537682}

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