m^2+20m-4=0

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Solution for m^2+20m-4=0 equation:


Simplifying
m2 + 20m + -4 = 0

Reorder the terms:
-4 + 20m + m2 = 0

Solving
-4 + 20m + m2 = 0

Solving for variable 'm'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 20m + 4 + m2 = 0 + 4

Reorder the terms:
-4 + 4 + 20m + m2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 20m + m2 = 0 + 4
20m + m2 = 0 + 4

Combine like terms: 0 + 4 = 4
20m + m2 = 4

The m term is 20m.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20m + 100 + m2 = 4 + 100

Reorder the terms:
100 + 20m + m2 = 4 + 100

Combine like terms: 4 + 100 = 104
100 + 20m + m2 = 104

Factor a perfect square on the left side:
(m + 10)(m + 10) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(m + 10) equal to 10.198039027 and -10.198039027.

Subproblem 1

m + 10 = 10.198039027 Simplifying m + 10 = 10.198039027 Reorder the terms: 10 + m = 10.198039027 Solving 10 + m = 10.198039027 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + m = 10.198039027 + -10 Combine like terms: 10 + -10 = 0 0 + m = 10.198039027 + -10 m = 10.198039027 + -10 Combine like terms: 10.198039027 + -10 = 0.198039027 m = 0.198039027 Simplifying m = 0.198039027

Subproblem 2

m + 10 = -10.198039027 Simplifying m + 10 = -10.198039027 Reorder the terms: 10 + m = -10.198039027 Solving 10 + m = -10.198039027 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + m = -10.198039027 + -10 Combine like terms: 10 + -10 = 0 0 + m = -10.198039027 + -10 m = -10.198039027 + -10 Combine like terms: -10.198039027 + -10 = -20.198039027 m = -20.198039027 Simplifying m = -20.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.198039027, -20.198039027}

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