10m^2-21m-6=0

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Solution for 10m^2-21m-6=0 equation:


Simplifying
10m2 + -21m + -6 = 0

Reorder the terms:
-6 + -21m + 10m2 = 0

Solving
-6 + -21m + 10m2 = 0

Solving for variable 'm'.

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

Divide each side by '10'.
-0.6 + -2.1m + m2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -2.1m + 0.6 + m2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -2.1m + m2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -2.1m + m2 = 0 + 0.6
-2.1m + m2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-2.1m + m2 = 0.6

The m term is -2.1m.  Take half its coefficient (-1.05).
Square it (1.1025) and add it to both sides.

Add '1.1025' to each side of the equation.
-2.1m + 1.1025 + m2 = 0.6 + 1.1025

Reorder the terms:
1.1025 + -2.1m + m2 = 0.6 + 1.1025

Combine like terms: 0.6 + 1.1025 = 1.7025
1.1025 + -2.1m + m2 = 1.7025

Factor a perfect square on the left side:
(m + -1.05)(m + -1.05) = 1.7025

Calculate the square root of the right side: 1.304798835

Break this problem into two subproblems by setting 
(m + -1.05) equal to 1.304798835 and -1.304798835.

Subproblem 1

m + -1.05 = 1.304798835 Simplifying m + -1.05 = 1.304798835 Reorder the terms: -1.05 + m = 1.304798835 Solving -1.05 + m = 1.304798835 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.05' to each side of the equation. -1.05 + 1.05 + m = 1.304798835 + 1.05 Combine like terms: -1.05 + 1.05 = 0.00 0.00 + m = 1.304798835 + 1.05 m = 1.304798835 + 1.05 Combine like terms: 1.304798835 + 1.05 = 2.354798835 m = 2.354798835 Simplifying m = 2.354798835

Subproblem 2

m + -1.05 = -1.304798835 Simplifying m + -1.05 = -1.304798835 Reorder the terms: -1.05 + m = -1.304798835 Solving -1.05 + m = -1.304798835 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.05' to each side of the equation. -1.05 + 1.05 + m = -1.304798835 + 1.05 Combine like terms: -1.05 + 1.05 = 0.00 0.00 + m = -1.304798835 + 1.05 m = -1.304798835 + 1.05 Combine like terms: -1.304798835 + 1.05 = -0.254798835 m = -0.254798835 Simplifying m = -0.254798835

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.354798835, -0.254798835}

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