10m^2+3m-21=0

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Solution for 10m^2+3m-21=0 equation:


Simplifying
10m2 + 3m + -21 = 0

Reorder the terms:
-21 + 3m + 10m2 = 0

Solving
-21 + 3m + 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'.
-2.1 + 0.3m + m2 = 0

Move the constant term to the right:

Add '2.1' to each side of the equation.
-2.1 + 0.3m + 2.1 + m2 = 0 + 2.1

Reorder the terms:
-2.1 + 2.1 + 0.3m + m2 = 0 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + 0.3m + m2 = 0 + 2.1
0.3m + m2 = 0 + 2.1

Combine like terms: 0 + 2.1 = 2.1
0.3m + m2 = 2.1

The m term is 0.3m.  Take half its coefficient (0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
0.3m + 0.0225 + m2 = 2.1 + 0.0225

Reorder the terms:
0.0225 + 0.3m + m2 = 2.1 + 0.0225

Combine like terms: 2.1 + 0.0225 = 2.1225
0.0225 + 0.3m + m2 = 2.1225

Factor a perfect square on the left side:
(m + 0.15)(m + 0.15) = 2.1225

Calculate the square root of the right side: 1.456880228

Break this problem into two subproblems by setting 
(m + 0.15) equal to 1.456880228 and -1.456880228.

Subproblem 1

m + 0.15 = 1.456880228 Simplifying m + 0.15 = 1.456880228 Reorder the terms: 0.15 + m = 1.456880228 Solving 0.15 + m = 1.456880228 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + m = 1.456880228 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + m = 1.456880228 + -0.15 m = 1.456880228 + -0.15 Combine like terms: 1.456880228 + -0.15 = 1.306880228 m = 1.306880228 Simplifying m = 1.306880228

Subproblem 2

m + 0.15 = -1.456880228 Simplifying m + 0.15 = -1.456880228 Reorder the terms: 0.15 + m = -1.456880228 Solving 0.15 + m = -1.456880228 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + m = -1.456880228 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + m = -1.456880228 + -0.15 m = -1.456880228 + -0.15 Combine like terms: -1.456880228 + -0.15 = -1.606880228 m = -1.606880228 Simplifying m = -1.606880228

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.306880228, -1.606880228}

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