m(2m+7)=19

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Solution for m(2m+7)=19 equation:


Simplifying
m(2m + 7) = 19

Reorder the terms:
m(7 + 2m) = 19
(7 * m + 2m * m) = 19
(7m + 2m2) = 19

Solving
7m + 2m2 = 19

Solving for variable 'm'.

Reorder the terms:
-19 + 7m + 2m2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + 7m + 2m2 = 0

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

Divide each side by '2'.
-9.5 + 3.5m + m2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + 3.5m + 9.5 + m2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + 3.5m + m2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + 3.5m + m2 = 0 + 9.5
3.5m + m2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
3.5m + m2 = 9.5

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 = 9.5 + 3.0625

Reorder the terms:
3.0625 + 3.5m + m2 = 9.5 + 3.0625

Combine like terms: 9.5 + 3.0625 = 12.5625
3.0625 + 3.5m + m2 = 12.5625

Factor a perfect square on the left side:
(m + 1.75)(m + 1.75) = 12.5625

Calculate the square root of the right side: 3.54436172

Break this problem into two subproblems by setting 
(m + 1.75) equal to 3.54436172 and -3.54436172.

Subproblem 1

m + 1.75 = 3.54436172 Simplifying m + 1.75 = 3.54436172 Reorder the terms: 1.75 + m = 3.54436172 Solving 1.75 + m = 3.54436172 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 = 3.54436172 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + m = 3.54436172 + -1.75 m = 3.54436172 + -1.75 Combine like terms: 3.54436172 + -1.75 = 1.79436172 m = 1.79436172 Simplifying m = 1.79436172

Subproblem 2

m + 1.75 = -3.54436172 Simplifying m + 1.75 = -3.54436172 Reorder the terms: 1.75 + m = -3.54436172 Solving 1.75 + m = -3.54436172 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 = -3.54436172 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + m = -3.54436172 + -1.75 m = -3.54436172 + -1.75 Combine like terms: -3.54436172 + -1.75 = -5.29436172 m = -5.29436172 Simplifying m = -5.29436172

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.79436172, -5.29436172}

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