3m^2-10m-21=

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


Simplifying
3m2 + -10m + -21 = 0

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

Solving
-21 + -10m + 3m2 = 0

Solving for variable 'm'.

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

Divide each side by '3'.
-7 + -3.333333333m + m2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -3.333333333m + 7 + m2 = 0 + 7

Reorder the terms:
-7 + 7 + -3.333333333m + m2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -3.333333333m + m2 = 0 + 7
-3.333333333m + m2 = 0 + 7

Combine like terms: 0 + 7 = 7
-3.333333333m + m2 = 7

The m term is -3.333333333m.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333m + 2.777777779 + m2 = 7 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333m + m2 = 7 + 2.777777779

Combine like terms: 7 + 2.777777779 = 9.777777779
2.777777779 + -3.333333333m + m2 = 9.777777779

Factor a perfect square on the left side:
(m + -1.666666667)(m + -1.666666667) = 9.777777779

Calculate the square root of the right side: 3.12694384

Break this problem into two subproblems by setting 
(m + -1.666666667) equal to 3.12694384 and -3.12694384.

Subproblem 1

m + -1.666666667 = 3.12694384 Simplifying m + -1.666666667 = 3.12694384 Reorder the terms: -1.666666667 + m = 3.12694384 Solving -1.666666667 + m = 3.12694384 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + m = 3.12694384 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + m = 3.12694384 + 1.666666667 m = 3.12694384 + 1.666666667 Combine like terms: 3.12694384 + 1.666666667 = 4.793610507 m = 4.793610507 Simplifying m = 4.793610507

Subproblem 2

m + -1.666666667 = -3.12694384 Simplifying m + -1.666666667 = -3.12694384 Reorder the terms: -1.666666667 + m = -3.12694384 Solving -1.666666667 + m = -3.12694384 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + m = -3.12694384 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + m = -3.12694384 + 1.666666667 m = -3.12694384 + 1.666666667 Combine like terms: -3.12694384 + 1.666666667 = -1.460277173 m = -1.460277173 Simplifying m = -1.460277173

Solution

The solution to the problem is based on the solutions from the subproblems. m = {4.793610507, -1.460277173}

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