5m^2+2m=9

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Solution for 5m^2+2m=9 equation:


Simplifying
5m2 + 2m = 9

Reorder the terms:
2m + 5m2 = 9

Solving
2m + 5m2 = 9

Solving for variable 'm'.

Reorder the terms:
-9 + 2m + 5m2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 2m + 5m2 = 0

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

Divide each side by '5'.
-1.8 + 0.4m + m2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + 0.4m + 1.8 + m2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + 0.4m + m2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + 0.4m + m2 = 0 + 1.8
0.4m + m2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
0.4m + m2 = 1.8

The m term is 0.4m.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4m + 0.04 + m2 = 1.8 + 0.04

Reorder the terms:
0.04 + 0.4m + m2 = 1.8 + 0.04

Combine like terms: 1.8 + 0.04 = 1.84
0.04 + 0.4m + m2 = 1.84

Factor a perfect square on the left side:
(m + 0.2)(m + 0.2) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(m + 0.2) equal to 1.356465997 and -1.356465997.

Subproblem 1

m + 0.2 = 1.356465997 Simplifying m + 0.2 = 1.356465997 Reorder the terms: 0.2 + m = 1.356465997 Solving 0.2 + m = 1.356465997 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + m = 1.356465997 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + m = 1.356465997 + -0.2 m = 1.356465997 + -0.2 Combine like terms: 1.356465997 + -0.2 = 1.156465997 m = 1.156465997 Simplifying m = 1.156465997

Subproblem 2

m + 0.2 = -1.356465997 Simplifying m + 0.2 = -1.356465997 Reorder the terms: 0.2 + m = -1.356465997 Solving 0.2 + m = -1.356465997 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + m = -1.356465997 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + m = -1.356465997 + -0.2 m = -1.356465997 + -0.2 Combine like terms: -1.356465997 + -0.2 = -1.556465997 m = -1.556465997 Simplifying m = -1.556465997

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.156465997, -1.556465997}

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