2m^2+7m+1=0

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Solution for 2m^2+7m+1=0 equation:


Simplifying
2m2 + 7m + 1 = 0

Reorder the terms:
1 + 7m + 2m2 = 0

Solving
1 + 7m + 2m2 = 0

Solving for variable 'm'.

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

Divide each side by '2'.
0.5 + 3.5m + m2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 3.5m + -0.5 + m2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 3.5m + m2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 3.5m + m2 = 0 + -0.5
3.5m + m2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
3.5m + m2 = -0.5

The m term is 3.5m.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5m + 3.0625 + m2 = -0.5 + 3.0625

Reorder the terms:
3.0625 + 3.5m + m2 = -0.5 + 3.0625

Combine like terms: -0.5 + 3.0625 = 2.5625
3.0625 + 3.5m + m2 = 2.5625

Factor a perfect square on the left side:
(m + 1.75)(m + 1.75) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(m + 1.75) equal to 1.600781059 and -1.600781059.

Subproblem 1

m + 1.75 = 1.600781059 Simplifying m + 1.75 = 1.600781059 Reorder the terms: 1.75 + m = 1.600781059 Solving 1.75 + m = 1.600781059 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + m = 1.600781059 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + m = 1.600781059 + -1.75 m = 1.600781059 + -1.75 Combine like terms: 1.600781059 + -1.75 = -0.149218941 m = -0.149218941 Simplifying m = -0.149218941

Subproblem 2

m + 1.75 = -1.600781059 Simplifying m + 1.75 = -1.600781059 Reorder the terms: 1.75 + m = -1.600781059 Solving 1.75 + m = -1.600781059 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + m = -1.600781059 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + m = -1.600781059 + -1.75 m = -1.600781059 + -1.75 Combine like terms: -1.600781059 + -1.75 = -3.350781059 m = -3.350781059 Simplifying m = -3.350781059

Solution

The solution to the problem is based on the solutions from the subproblems. m = {-0.149218941, -3.350781059}

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