0=m^2+2m-7

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


Simplifying
0 = m2 + 2m + -7

Reorder the terms:
0 = -7 + 2m + m2

Solving
0 = -7 + 2m + m2

Solving for variable 'm'.

Combine like terms: 0 + 7 = 7
7 + -2m + -1m2 = -7 + 2m + m2 + 7 + -2m + -1m2

Reorder the terms:
7 + -2m + -1m2 = -7 + 7 + 2m + -2m + m2 + -1m2

Combine like terms: -7 + 7 = 0
7 + -2m + -1m2 = 0 + 2m + -2m + m2 + -1m2
7 + -2m + -1m2 = 2m + -2m + m2 + -1m2

Combine like terms: 2m + -2m = 0
7 + -2m + -1m2 = 0 + m2 + -1m2
7 + -2m + -1m2 = m2 + -1m2

Combine like terms: m2 + -1m2 = 0
7 + -2m + -1m2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-7 + 2m + m2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 2m + 7 + m2 = 0 + 7

Reorder the terms:
-7 + 7 + 2m + m2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 2m + m2 = 0 + 7
2m + m2 = 0 + 7

Combine like terms: 0 + 7 = 7
2m + m2 = 7

The m term is 2m.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2m + 1 + m2 = 7 + 1

Reorder the terms:
1 + 2m + m2 = 7 + 1

Combine like terms: 7 + 1 = 8
1 + 2m + m2 = 8

Factor a perfect square on the left side:
(m + 1)(m + 1) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(m + 1) equal to 2.828427125 and -2.828427125.

Subproblem 1

m + 1 = 2.828427125 Simplifying m + 1 = 2.828427125 Reorder the terms: 1 + m = 2.828427125 Solving 1 + m = 2.828427125 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + m = 2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + m = 2.828427125 + -1 m = 2.828427125 + -1 Combine like terms: 2.828427125 + -1 = 1.828427125 m = 1.828427125 Simplifying m = 1.828427125

Subproblem 2

m + 1 = -2.828427125 Simplifying m + 1 = -2.828427125 Reorder the terms: 1 + m = -2.828427125 Solving 1 + m = -2.828427125 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + m = -2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + m = -2.828427125 + -1 m = -2.828427125 + -1 Combine like terms: -2.828427125 + -1 = -3.828427125 m = -3.828427125 Simplifying m = -3.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.828427125, -3.828427125}

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