5m^2+10m-80=7

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Solution for 5m^2+10m-80=7 equation:


Simplifying
5m2 + 10m + -80 = 7

Reorder the terms:
-80 + 10m + 5m2 = 7

Solving
-80 + 10m + 5m2 = 7

Solving for variable 'm'.

Reorder the terms:
-80 + -7 + 10m + 5m2 = 7 + -7

Combine like terms: -80 + -7 = -87
-87 + 10m + 5m2 = 7 + -7

Combine like terms: 7 + -7 = 0
-87 + 10m + 5m2 = 0

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

Divide each side by '5'.
-17.4 + 2m + m2 = 0

Move the constant term to the right:

Add '17.4' to each side of the equation.
-17.4 + 2m + 17.4 + m2 = 0 + 17.4

Reorder the terms:
-17.4 + 17.4 + 2m + m2 = 0 + 17.4

Combine like terms: -17.4 + 17.4 = 0.0
0.0 + 2m + m2 = 0 + 17.4
2m + m2 = 0 + 17.4

Combine like terms: 0 + 17.4 = 17.4
2m + m2 = 17.4

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 = 17.4 + 1

Reorder the terms:
1 + 2m + m2 = 17.4 + 1

Combine like terms: 17.4 + 1 = 18.4
1 + 2m + m2 = 18.4

Factor a perfect square on the left side:
(m + 1)(m + 1) = 18.4

Calculate the square root of the right side: 4.289522118

Break this problem into two subproblems by setting 
(m + 1) equal to 4.289522118 and -4.289522118.

Subproblem 1

m + 1 = 4.289522118 Simplifying m + 1 = 4.289522118 Reorder the terms: 1 + m = 4.289522118 Solving 1 + m = 4.289522118 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 = 4.289522118 + -1 Combine like terms: 1 + -1 = 0 0 + m = 4.289522118 + -1 m = 4.289522118 + -1 Combine like terms: 4.289522118 + -1 = 3.289522118 m = 3.289522118 Simplifying m = 3.289522118

Subproblem 2

m + 1 = -4.289522118 Simplifying m + 1 = -4.289522118 Reorder the terms: 1 + m = -4.289522118 Solving 1 + m = -4.289522118 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 = -4.289522118 + -1 Combine like terms: 1 + -1 = 0 0 + m = -4.289522118 + -1 m = -4.289522118 + -1 Combine like terms: -4.289522118 + -1 = -5.289522118 m = -5.289522118 Simplifying m = -5.289522118

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.289522118, -5.289522118}

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