9m^2+18m-13=0

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Solution for 9m^2+18m-13=0 equation:


Simplifying
9m2 + 18m + -13 = 0

Reorder the terms:
-13 + 18m + 9m2 = 0

Solving
-13 + 18m + 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 + 2m + m2 = 0

Move the constant term to the right:

Add '1.444444444' to each side of the equation.
-1.444444444 + 2m + 1.444444444 + m2 = 0 + 1.444444444

Reorder the terms:
-1.444444444 + 1.444444444 + 2m + m2 = 0 + 1.444444444

Combine like terms: -1.444444444 + 1.444444444 = 0.000000000
0.000000000 + 2m + m2 = 0 + 1.444444444
2m + m2 = 0 + 1.444444444

Combine like terms: 0 + 1.444444444 = 1.444444444
2m + m2 = 1.444444444

The m term is 2m.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2m + 1 + m2 = 1.444444444 + 1

Reorder the terms:
1 + 2m + m2 = 1.444444444 + 1

Combine like terms: 1.444444444 + 1 = 2.444444444
1 + 2m + m2 = 2.444444444

Factor a perfect square on the left side:
(m + 1)(m + 1) = 2.444444444

Calculate the square root of the right side: 1.56347192

Break this problem into two subproblems by setting 
(m + 1) equal to 1.56347192 and -1.56347192.

Subproblem 1

m + 1 = 1.56347192 Simplifying m + 1 = 1.56347192 Reorder the terms: 1 + m = 1.56347192 Solving 1 + m = 1.56347192 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + m = 1.56347192 + -1 Combine like terms: 1 + -1 = 0 0 + m = 1.56347192 + -1 m = 1.56347192 + -1 Combine like terms: 1.56347192 + -1 = 0.56347192 m = 0.56347192 Simplifying m = 0.56347192

Subproblem 2

m + 1 = -1.56347192 Simplifying m + 1 = -1.56347192 Reorder the terms: 1 + m = -1.56347192 Solving 1 + m = -1.56347192 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + m = -1.56347192 + -1 Combine like terms: 1 + -1 = 0 0 + m = -1.56347192 + -1 m = -1.56347192 + -1 Combine like terms: -1.56347192 + -1 = -2.56347192 m = -2.56347192 Simplifying m = -2.56347192

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.56347192, -2.56347192}

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