=(-7M^2+8M-6)-(-5M^2-5M-10)

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Solution for =(-7M^2+8M-6)-(-5M^2-5M-10) equation:


Simplifying
0 = (-7M2 + 8M + -6) + -1(-5M2 + -5M + -10)

Reorder the terms:
0 = (-6 + 8M + -7M2) + -1(-5M2 + -5M + -10)

Remove parenthesis around (-6 + 8M + -7M2)
0 = -6 + 8M + -7M2 + -1(-5M2 + -5M + -10)

Reorder the terms:
0 = -6 + 8M + -7M2 + -1(-10 + -5M + -5M2)
0 = -6 + 8M + -7M2 + (-10 * -1 + -5M * -1 + -5M2 * -1)
0 = -6 + 8M + -7M2 + (10 + 5M + 5M2)

Reorder the terms:
0 = -6 + 10 + 8M + 5M + -7M2 + 5M2

Combine like terms: -6 + 10 = 4
0 = 4 + 8M + 5M + -7M2 + 5M2

Combine like terms: 8M + 5M = 13M
0 = 4 + 13M + -7M2 + 5M2

Combine like terms: -7M2 + 5M2 = -2M2
0 = 4 + 13M + -2M2

Solving
0 = 4 + 13M + -2M2

Solving for variable 'M'.

Combine like terms: 0 + -4 = -4
-4 + -13M + 2M2 = 4 + 13M + -2M2 + -4 + -13M + 2M2

Reorder the terms:
-4 + -13M + 2M2 = 4 + -4 + 13M + -13M + -2M2 + 2M2

Combine like terms: 4 + -4 = 0
-4 + -13M + 2M2 = 0 + 13M + -13M + -2M2 + 2M2
-4 + -13M + 2M2 = 13M + -13M + -2M2 + 2M2

Combine like terms: 13M + -13M = 0
-4 + -13M + 2M2 = 0 + -2M2 + 2M2
-4 + -13M + 2M2 = -2M2 + 2M2

Combine like terms: -2M2 + 2M2 = 0
-4 + -13M + 2M2 = 0

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

Divide each side by '2'.
-2 + -6.5M + M2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -6.5M + 2 + M2 = 0 + 2

Reorder the terms:
-2 + 2 + -6.5M + M2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -6.5M + M2 = 0 + 2
-6.5M + M2 = 0 + 2

Combine like terms: 0 + 2 = 2
-6.5M + M2 = 2

The M term is -6.5M.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5M + 10.5625 + M2 = 2 + 10.5625

Reorder the terms:
10.5625 + -6.5M + M2 = 2 + 10.5625

Combine like terms: 2 + 10.5625 = 12.5625
10.5625 + -6.5M + M2 = 12.5625

Factor a perfect square on the left side:
(M + -3.25)(M + -3.25) = 12.5625

Calculate the square root of the right side: 3.54436172

Break this problem into two subproblems by setting 
(M + -3.25) equal to 3.54436172 and -3.54436172.

Subproblem 1

M + -3.25 = 3.54436172 Simplifying M + -3.25 = 3.54436172 Reorder the terms: -3.25 + M = 3.54436172 Solving -3.25 + M = 3.54436172 Solving for variable 'M'. Move all terms containing M to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + M = 3.54436172 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + M = 3.54436172 + 3.25 M = 3.54436172 + 3.25 Combine like terms: 3.54436172 + 3.25 = 6.79436172 M = 6.79436172 Simplifying M = 6.79436172

Subproblem 2

M + -3.25 = -3.54436172 Simplifying M + -3.25 = -3.54436172 Reorder the terms: -3.25 + M = -3.54436172 Solving -3.25 + M = -3.54436172 Solving for variable 'M'. Move all terms containing M to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + M = -3.54436172 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + M = -3.54436172 + 3.25 M = -3.54436172 + 3.25 Combine like terms: -3.54436172 + 3.25 = -0.29436172 M = -0.29436172 Simplifying M = -0.29436172

Solution

The solution to the problem is based on the solutions from the subproblems. M = {6.79436172, -0.29436172}

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