5m^2-3m-15=0

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Solution for 5m^2-3m-15=0 equation:


Simplifying
5m2 + -3m + -15 = 0

Reorder the terms:
-15 + -3m + 5m2 = 0

Solving
-15 + -3m + 5m2 = 0

Solving for variable 'm'.

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

Divide each side by '5'.
-3 + -0.6m + m2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.6m + 3 + m2 = 0 + 3

Reorder the terms:
-3 + 3 + -0.6m + m2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.6m + m2 = 0 + 3
-0.6m + m2 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.6m + m2 = 3

The m term is -0.6m.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6m + 0.09 + m2 = 3 + 0.09

Reorder the terms:
0.09 + -0.6m + m2 = 3 + 0.09

Combine like terms: 3 + 0.09 = 3.09
0.09 + -0.6m + m2 = 3.09

Factor a perfect square on the left side:
(m + -0.3)(m + -0.3) = 3.09

Calculate the square root of the right side: 1.757839583

Break this problem into two subproblems by setting 
(m + -0.3) equal to 1.757839583 and -1.757839583.

Subproblem 1

m + -0.3 = 1.757839583 Simplifying m + -0.3 = 1.757839583 Reorder the terms: -0.3 + m = 1.757839583 Solving -0.3 + m = 1.757839583 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + m = 1.757839583 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + m = 1.757839583 + 0.3 m = 1.757839583 + 0.3 Combine like terms: 1.757839583 + 0.3 = 2.057839583 m = 2.057839583 Simplifying m = 2.057839583

Subproblem 2

m + -0.3 = -1.757839583 Simplifying m + -0.3 = -1.757839583 Reorder the terms: -0.3 + m = -1.757839583 Solving -0.3 + m = -1.757839583 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + m = -1.757839583 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + m = -1.757839583 + 0.3 m = -1.757839583 + 0.3 Combine like terms: -1.757839583 + 0.3 = -1.457839583 m = -1.457839583 Simplifying m = -1.457839583

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.057839583, -1.457839583}

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