4n^2-9n-18=6

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Solution for 4n^2-9n-18=6 equation:


Simplifying
4n2 + -9n + -18 = 6

Reorder the terms:
-18 + -9n + 4n2 = 6

Solving
-18 + -9n + 4n2 = 6

Solving for variable 'n'.

Reorder the terms:
-18 + -6 + -9n + 4n2 = 6 + -6

Combine like terms: -18 + -6 = -24
-24 + -9n + 4n2 = 6 + -6

Combine like terms: 6 + -6 = 0
-24 + -9n + 4n2 = 0

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

Divide each side by '4'.
-6 + -2.25n + n2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -2.25n + 6 + n2 = 0 + 6

Reorder the terms:
-6 + 6 + -2.25n + n2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -2.25n + n2 = 0 + 6
-2.25n + n2 = 0 + 6

Combine like terms: 0 + 6 = 6
-2.25n + n2 = 6

The n term is -2.25n.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25n + 1.265625 + n2 = 6 + 1.265625

Reorder the terms:
1.265625 + -2.25n + n2 = 6 + 1.265625

Combine like terms: 6 + 1.265625 = 7.265625
1.265625 + -2.25n + n2 = 7.265625

Factor a perfect square on the left side:
(n + -1.125)(n + -1.125) = 7.265625

Calculate the square root of the right side: 2.695482332

Break this problem into two subproblems by setting 
(n + -1.125) equal to 2.695482332 and -2.695482332.

Subproblem 1

n + -1.125 = 2.695482332 Simplifying n + -1.125 = 2.695482332 Reorder the terms: -1.125 + n = 2.695482332 Solving -1.125 + n = 2.695482332 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + n = 2.695482332 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + n = 2.695482332 + 1.125 n = 2.695482332 + 1.125 Combine like terms: 2.695482332 + 1.125 = 3.820482332 n = 3.820482332 Simplifying n = 3.820482332

Subproblem 2

n + -1.125 = -2.695482332 Simplifying n + -1.125 = -2.695482332 Reorder the terms: -1.125 + n = -2.695482332 Solving -1.125 + n = -2.695482332 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + n = -2.695482332 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + n = -2.695482332 + 1.125 n = -2.695482332 + 1.125 Combine like terms: -2.695482332 + 1.125 = -1.570482332 n = -1.570482332 Simplifying n = -1.570482332

Solution

The solution to the problem is based on the solutions from the subproblems. n = {3.820482332, -1.570482332}

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