9n^2-5n-2=4

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Solution for 9n^2-5n-2=4 equation:


Simplifying
9n2 + -5n + -2 = 4

Reorder the terms:
-2 + -5n + 9n2 = 4

Solving
-2 + -5n + 9n2 = 4

Solving for variable 'n'.

Reorder the terms:
-2 + -4 + -5n + 9n2 = 4 + -4

Combine like terms: -2 + -4 = -6
-6 + -5n + 9n2 = 4 + -4

Combine like terms: 4 + -4 = 0
-6 + -5n + 9n2 = 0

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

Divide each side by '9'.
-0.6666666667 + -0.5555555556n + n2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -0.5555555556n + 0.6666666667 + n2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -0.5555555556n + n2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -0.5555555556n + n2 = 0 + 0.6666666667
-0.5555555556n + n2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-0.5555555556n + n2 = 0.6666666667

The n term is -0.5555555556n.  Take half its coefficient (-0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
-0.5555555556n + 0.07716049384 + n2 = 0.6666666667 + 0.07716049384

Reorder the terms:
0.07716049384 + -0.5555555556n + n2 = 0.6666666667 + 0.07716049384

Combine like terms: 0.6666666667 + 0.07716049384 = 0.74382716054
0.07716049384 + -0.5555555556n + n2 = 0.74382716054

Factor a perfect square on the left side:
(n + -0.2777777778)(n + -0.2777777778) = 0.74382716054

Calculate the square root of the right side: 0.86245415

Break this problem into two subproblems by setting 
(n + -0.2777777778) equal to 0.86245415 and -0.86245415.

Subproblem 1

n + -0.2777777778 = 0.86245415 Simplifying n + -0.2777777778 = 0.86245415 Reorder the terms: -0.2777777778 + n = 0.86245415 Solving -0.2777777778 + n = 0.86245415 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + n = 0.86245415 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + n = 0.86245415 + 0.2777777778 n = 0.86245415 + 0.2777777778 Combine like terms: 0.86245415 + 0.2777777778 = 1.1402319278 n = 1.1402319278 Simplifying n = 1.1402319278

Subproblem 2

n + -0.2777777778 = -0.86245415 Simplifying n + -0.2777777778 = -0.86245415 Reorder the terms: -0.2777777778 + n = -0.86245415 Solving -0.2777777778 + n = -0.86245415 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + n = -0.86245415 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + n = -0.86245415 + 0.2777777778 n = -0.86245415 + 0.2777777778 Combine like terms: -0.86245415 + 0.2777777778 = -0.5846763722 n = -0.5846763722 Simplifying n = -0.5846763722

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.1402319278, -0.5846763722}

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