4m^2-12m-15=0

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Solution for 4m^2-12m-15=0 equation:


Simplifying
4m2 + -12m + -15 = 0

Reorder the terms:
-15 + -12m + 4m2 = 0

Solving
-15 + -12m + 4m2 = 0

Solving for variable 'm'.

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

Divide each side by '4'.
-3.75 + -3m + m2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -3m + 3.75 + m2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -3m + m2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -3m + m2 = 0 + 3.75
-3m + m2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-3m + m2 = 3.75

The m term is -3m.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3m + 2.25 + m2 = 3.75 + 2.25

Reorder the terms:
2.25 + -3m + m2 = 3.75 + 2.25

Combine like terms: 3.75 + 2.25 = 6
2.25 + -3m + m2 = 6

Factor a perfect square on the left side:
(m + -1.5)(m + -1.5) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(m + -1.5) equal to 2.449489743 and -2.449489743.

Subproblem 1

m + -1.5 = 2.449489743 Simplifying m + -1.5 = 2.449489743 Reorder the terms: -1.5 + m = 2.449489743 Solving -1.5 + m = 2.449489743 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + m = 2.449489743 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + m = 2.449489743 + 1.5 m = 2.449489743 + 1.5 Combine like terms: 2.449489743 + 1.5 = 3.949489743 m = 3.949489743 Simplifying m = 3.949489743

Subproblem 2

m + -1.5 = -2.449489743 Simplifying m + -1.5 = -2.449489743 Reorder the terms: -1.5 + m = -2.449489743 Solving -1.5 + m = -2.449489743 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + m = -2.449489743 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + m = -2.449489743 + 1.5 m = -2.449489743 + 1.5 Combine like terms: -2.449489743 + 1.5 = -0.949489743 m = -0.949489743 Simplifying m = -0.949489743

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.949489743, -0.949489743}

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