8m^2-8m-7=0

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Solution for 8m^2-8m-7=0 equation:


Simplifying
8m2 + -8m + -7 = 0

Reorder the terms:
-7 + -8m + 8m2 = 0

Solving
-7 + -8m + 8m2 = 0

Solving for variable 'm'.

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

Divide each side by '8'.
-0.875 + -1m + m2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -1m + 0.875 + m2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -1m + m2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -1m + m2 = 0 + 0.875
-1m + m2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-1m + m2 = 0.875

The m term is -1m.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1m + 0.25 + m2 = 0.875 + 0.25

Reorder the terms:
0.25 + -1m + m2 = 0.875 + 0.25

Combine like terms: 0.875 + 0.25 = 1.125
0.25 + -1m + m2 = 1.125

Factor a perfect square on the left side:
(m + -0.5)(m + -0.5) = 1.125

Calculate the square root of the right side: 1.060660172

Break this problem into two subproblems by setting 
(m + -0.5) equal to 1.060660172 and -1.060660172.

Subproblem 1

m + -0.5 = 1.060660172 Simplifying m + -0.5 = 1.060660172 Reorder the terms: -0.5 + m = 1.060660172 Solving -0.5 + m = 1.060660172 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = 1.060660172 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = 1.060660172 + 0.5 m = 1.060660172 + 0.5 Combine like terms: 1.060660172 + 0.5 = 1.560660172 m = 1.560660172 Simplifying m = 1.560660172

Subproblem 2

m + -0.5 = -1.060660172 Simplifying m + -0.5 = -1.060660172 Reorder the terms: -0.5 + m = -1.060660172 Solving -0.5 + m = -1.060660172 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = -1.060660172 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = -1.060660172 + 0.5 m = -1.060660172 + 0.5 Combine like terms: -1.060660172 + 0.5 = -0.560660172 m = -0.560660172 Simplifying m = -0.560660172

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.560660172, -0.560660172}

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