9m^2-8m-13=0

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Solution for 9m^2-8m-13=0 equation:


Simplifying
9m2 + -8m + -13 = 0

Reorder the terms:
-13 + -8m + 9m2 = 0

Solving
-13 + -8m + 9m2 = 0

Solving for variable 'm'.

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

Divide each side by '9'.
-1.444444444 + -0.8888888889m + m2 = 0

Move the constant term to the right:

Add '1.444444444' to each side of the equation.
-1.444444444 + -0.8888888889m + 1.444444444 + m2 = 0 + 1.444444444

Reorder the terms:
-1.444444444 + 1.444444444 + -0.8888888889m + m2 = 0 + 1.444444444

Combine like terms: -1.444444444 + 1.444444444 = 0.000000000
0.000000000 + -0.8888888889m + m2 = 0 + 1.444444444
-0.8888888889m + m2 = 0 + 1.444444444

Combine like terms: 0 + 1.444444444 = 1.444444444
-0.8888888889m + m2 = 1.444444444

The m term is -0.8888888889m.  Take half its coefficient (-0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
-0.8888888889m + 0.1975308642 + m2 = 1.444444444 + 0.1975308642

Reorder the terms:
0.1975308642 + -0.8888888889m + m2 = 1.444444444 + 0.1975308642

Combine like terms: 1.444444444 + 0.1975308642 = 1.6419753082
0.1975308642 + -0.8888888889m + m2 = 1.6419753082

Factor a perfect square on the left side:
(m + -0.4444444445)(m + -0.4444444445) = 1.6419753082

Calculate the square root of the right side: 1.281395844

Break this problem into two subproblems by setting 
(m + -0.4444444445) equal to 1.281395844 and -1.281395844.

Subproblem 1

m + -0.4444444445 = 1.281395844 Simplifying m + -0.4444444445 = 1.281395844 Reorder the terms: -0.4444444445 + m = 1.281395844 Solving -0.4444444445 + m = 1.281395844 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + m = 1.281395844 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + m = 1.281395844 + 0.4444444445 m = 1.281395844 + 0.4444444445 Combine like terms: 1.281395844 + 0.4444444445 = 1.7258402885 m = 1.7258402885 Simplifying m = 1.7258402885

Subproblem 2

m + -0.4444444445 = -1.281395844 Simplifying m + -0.4444444445 = -1.281395844 Reorder the terms: -0.4444444445 + m = -1.281395844 Solving -0.4444444445 + m = -1.281395844 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + m = -1.281395844 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + m = -1.281395844 + 0.4444444445 m = -1.281395844 + 0.4444444445 Combine like terms: -1.281395844 + 0.4444444445 = -0.8369513995 m = -0.8369513995 Simplifying m = -0.8369513995

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.7258402885, -0.8369513995}

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