8m^2+11m=15

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Solution for 8m^2+11m=15 equation:


Simplifying
8m2 + 11m = 15

Reorder the terms:
11m + 8m2 = 15

Solving
11m + 8m2 = 15

Solving for variable 'm'.

Reorder the terms:
-15 + 11m + 8m2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 11m + 8m2 = 0

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

Divide each side by '8'.
-1.875 + 1.375m + m2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + 1.375m + 1.875 + m2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + 1.375m + m2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + 1.375m + m2 = 0 + 1.875
1.375m + m2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
1.375m + m2 = 1.875

The m term is 1.375m.  Take half its coefficient (0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
1.375m + 0.47265625 + m2 = 1.875 + 0.47265625

Reorder the terms:
0.47265625 + 1.375m + m2 = 1.875 + 0.47265625

Combine like terms: 1.875 + 0.47265625 = 2.34765625
0.47265625 + 1.375m + m2 = 2.34765625

Factor a perfect square on the left side:
(m + 0.6875)(m + 0.6875) = 2.34765625

Calculate the square root of the right side: 1.532206334

Break this problem into two subproblems by setting 
(m + 0.6875) equal to 1.532206334 and -1.532206334.

Subproblem 1

m + 0.6875 = 1.532206334 Simplifying m + 0.6875 = 1.532206334 Reorder the terms: 0.6875 + m = 1.532206334 Solving 0.6875 + m = 1.532206334 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.6875' to each side of the equation. 0.6875 + -0.6875 + m = 1.532206334 + -0.6875 Combine like terms: 0.6875 + -0.6875 = 0.0000 0.0000 + m = 1.532206334 + -0.6875 m = 1.532206334 + -0.6875 Combine like terms: 1.532206334 + -0.6875 = 0.844706334 m = 0.844706334 Simplifying m = 0.844706334

Subproblem 2

m + 0.6875 = -1.532206334 Simplifying m + 0.6875 = -1.532206334 Reorder the terms: 0.6875 + m = -1.532206334 Solving 0.6875 + m = -1.532206334 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.6875' to each side of the equation. 0.6875 + -0.6875 + m = -1.532206334 + -0.6875 Combine like terms: 0.6875 + -0.6875 = 0.0000 0.0000 + m = -1.532206334 + -0.6875 m = -1.532206334 + -0.6875 Combine like terms: -1.532206334 + -0.6875 = -2.219706334 m = -2.219706334 Simplifying m = -2.219706334

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.844706334, -2.219706334}

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