m^2+2m-8=3

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Solution for m^2+2m-8=3 equation:


Simplifying
m2 + 2m + -8 = 3

Reorder the terms:
-8 + 2m + m2 = 3

Solving
-8 + 2m + m2 = 3

Solving for variable 'm'.

Reorder the terms:
-8 + -3 + 2m + m2 = 3 + -3

Combine like terms: -8 + -3 = -11
-11 + 2m + m2 = 3 + -3

Combine like terms: 3 + -3 = 0
-11 + 2m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 2m + 11 + m2 = 0 + 11

Reorder the terms:
-11 + 11 + 2m + m2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 2m + m2 = 0 + 11
2m + m2 = 0 + 11

Combine like terms: 0 + 11 = 11
2m + m2 = 11

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 = 11 + 1

Reorder the terms:
1 + 2m + m2 = 11 + 1

Combine like terms: 11 + 1 = 12
1 + 2m + m2 = 12

Factor a perfect square on the left side:
(m + 1)(m + 1) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(m + 1) equal to 3.464101615 and -3.464101615.

Subproblem 1

m + 1 = 3.464101615 Simplifying m + 1 = 3.464101615 Reorder the terms: 1 + m = 3.464101615 Solving 1 + m = 3.464101615 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 = 3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + m = 3.464101615 + -1 m = 3.464101615 + -1 Combine like terms: 3.464101615 + -1 = 2.464101615 m = 2.464101615 Simplifying m = 2.464101615

Subproblem 2

m + 1 = -3.464101615 Simplifying m + 1 = -3.464101615 Reorder the terms: 1 + m = -3.464101615 Solving 1 + m = -3.464101615 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 = -3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + m = -3.464101615 + -1 m = -3.464101615 + -1 Combine like terms: -3.464101615 + -1 = -4.464101615 m = -4.464101615 Simplifying m = -4.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.464101615, -4.464101615}

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