5m^2-14m-8=0

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Solution for 5m^2-14m-8=0 equation:


Simplifying
5m2 + -14m + -8 = 0

Reorder the terms:
-8 + -14m + 5m2 = 0

Solving
-8 + -14m + 5m2 = 0

Solving for variable 'm'.

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

Divide each side by '5'.
-1.6 + -2.8m + m2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2.8m + 1.6 + m2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2.8m + m2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2.8m + m2 = 0 + 1.6
-2.8m + m2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2.8m + m2 = 1.6

The m term is -2.8m.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8m + 1.96 + m2 = 1.6 + 1.96

Reorder the terms:
1.96 + -2.8m + m2 = 1.6 + 1.96

Combine like terms: 1.6 + 1.96 = 3.56
1.96 + -2.8m + m2 = 3.56

Factor a perfect square on the left side:
(m + -1.4)(m + -1.4) = 3.56

Calculate the square root of the right side: 1.886796226

Break this problem into two subproblems by setting 
(m + -1.4) equal to 1.886796226 and -1.886796226.

Subproblem 1

m + -1.4 = 1.886796226 Simplifying m + -1.4 = 1.886796226 Reorder the terms: -1.4 + m = 1.886796226 Solving -1.4 + m = 1.886796226 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + m = 1.886796226 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + m = 1.886796226 + 1.4 m = 1.886796226 + 1.4 Combine like terms: 1.886796226 + 1.4 = 3.286796226 m = 3.286796226 Simplifying m = 3.286796226

Subproblem 2

m + -1.4 = -1.886796226 Simplifying m + -1.4 = -1.886796226 Reorder the terms: -1.4 + m = -1.886796226 Solving -1.4 + m = -1.886796226 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + m = -1.886796226 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + m = -1.886796226 + 1.4 m = -1.886796226 + 1.4 Combine like terms: -1.886796226 + 1.4 = -0.486796226 m = -0.486796226 Simplifying m = -0.486796226

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.286796226, -0.486796226}

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