10n^2-7n-4=0

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Solution for 10n^2-7n-4=0 equation:


Simplifying
10n2 + -7n + -4 = 0

Reorder the terms:
-4 + -7n + 10n2 = 0

Solving
-4 + -7n + 10n2 = 0

Solving for variable 'n'.

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

Divide each side by '10'.
-0.4 + -0.7n + n2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -0.7n + 0.4 + n2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -0.7n + n2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -0.7n + n2 = 0 + 0.4
-0.7n + n2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-0.7n + n2 = 0.4

The n term is -0.7n.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7n + 0.1225 + n2 = 0.4 + 0.1225

Reorder the terms:
0.1225 + -0.7n + n2 = 0.4 + 0.1225

Combine like terms: 0.4 + 0.1225 = 0.5225
0.1225 + -0.7n + n2 = 0.5225

Factor a perfect square on the left side:
(n + -0.35)(n + -0.35) = 0.5225

Calculate the square root of the right side: 0.722841615

Break this problem into two subproblems by setting 
(n + -0.35) equal to 0.722841615 and -0.722841615.

Subproblem 1

n + -0.35 = 0.722841615 Simplifying n + -0.35 = 0.722841615 Reorder the terms: -0.35 + n = 0.722841615 Solving -0.35 + n = 0.722841615 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + n = 0.722841615 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + n = 0.722841615 + 0.35 n = 0.722841615 + 0.35 Combine like terms: 0.722841615 + 0.35 = 1.072841615 n = 1.072841615 Simplifying n = 1.072841615

Subproblem 2

n + -0.35 = -0.722841615 Simplifying n + -0.35 = -0.722841615 Reorder the terms: -0.35 + n = -0.722841615 Solving -0.35 + n = -0.722841615 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + n = -0.722841615 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + n = -0.722841615 + 0.35 n = -0.722841615 + 0.35 Combine like terms: -0.722841615 + 0.35 = -0.372841615 n = -0.372841615 Simplifying n = -0.372841615

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.072841615, -0.372841615}

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