7m^2+m-8=3

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Solution for 7m^2+m-8=3 equation:


Simplifying
7m2 + m + -8 = 3

Reorder the terms:
-8 + m + 7m2 = 3

Solving
-8 + m + 7m2 = 3

Solving for variable 'm'.

Reorder the terms:
-8 + -3 + m + 7m2 = 3 + -3

Combine like terms: -8 + -3 = -11
-11 + m + 7m2 = 3 + -3

Combine like terms: 3 + -3 = 0
-11 + m + 7m2 = 0

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

Divide each side by '7'.
-1.571428571 + 0.1428571429m + m2 = 0

Move the constant term to the right:

Add '1.571428571' to each side of the equation.
-1.571428571 + 0.1428571429m + 1.571428571 + m2 = 0 + 1.571428571

Reorder the terms:
-1.571428571 + 1.571428571 + 0.1428571429m + m2 = 0 + 1.571428571

Combine like terms: -1.571428571 + 1.571428571 = 0.000000000
0.000000000 + 0.1428571429m + m2 = 0 + 1.571428571
0.1428571429m + m2 = 0 + 1.571428571

Combine like terms: 0 + 1.571428571 = 1.571428571
0.1428571429m + m2 = 1.571428571

The m term is m.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1428571429m + 0.25 + m2 = 1.571428571 + 0.25

Reorder the terms:
0.25 + 0.1428571429m + m2 = 1.571428571 + 0.25

Combine like terms: 1.571428571 + 0.25 = 1.821428571
0.25 + 0.1428571429m + m2 = 1.821428571

Factor a perfect square on the left side:
(m + 0.5)(m + 0.5) = 1.821428571

Calculate the square root of the right side: 1.349603116

Break this problem into two subproblems by setting 
(m + 0.5) equal to 1.349603116 and -1.349603116.

Subproblem 1

m + 0.5 = 1.349603116 Simplifying m + 0.5 = 1.349603116 Reorder the terms: 0.5 + m = 1.349603116 Solving 0.5 + m = 1.349603116 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = 1.349603116 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = 1.349603116 + -0.5 m = 1.349603116 + -0.5 Combine like terms: 1.349603116 + -0.5 = 0.849603116 m = 0.849603116 Simplifying m = 0.849603116

Subproblem 2

m + 0.5 = -1.349603116 Simplifying m + 0.5 = -1.349603116 Reorder the terms: 0.5 + m = -1.349603116 Solving 0.5 + m = -1.349603116 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = -1.349603116 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = -1.349603116 + -0.5 m = -1.349603116 + -0.5 Combine like terms: -1.349603116 + -0.5 = -1.849603116 m = -1.849603116 Simplifying m = -1.849603116

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.849603116, -1.849603116}

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