4n^2-15n-36=0

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Solution for 4n^2-15n-36=0 equation:


Simplifying
4n2 + -15n + -36 = 0

Reorder the terms:
-36 + -15n + 4n2 = 0

Solving
-36 + -15n + 4n2 = 0

Solving for variable 'n'.

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

Divide each side by '4'.
-9 + -3.75n + n2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -3.75n + 9 + n2 = 0 + 9

Reorder the terms:
-9 + 9 + -3.75n + n2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -3.75n + n2 = 0 + 9
-3.75n + n2 = 0 + 9

Combine like terms: 0 + 9 = 9
-3.75n + n2 = 9

The n term is -3.75n.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75n + 3.515625 + n2 = 9 + 3.515625

Reorder the terms:
3.515625 + -3.75n + n2 = 9 + 3.515625

Combine like terms: 9 + 3.515625 = 12.515625
3.515625 + -3.75n + n2 = 12.515625

Factor a perfect square on the left side:
(n + -1.875)(n + -1.875) = 12.515625

Calculate the square root of the right side: 3.537742925

Break this problem into two subproblems by setting 
(n + -1.875) equal to 3.537742925 and -3.537742925.

Subproblem 1

n + -1.875 = 3.537742925 Simplifying n + -1.875 = 3.537742925 Reorder the terms: -1.875 + n = 3.537742925 Solving -1.875 + n = 3.537742925 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + n = 3.537742925 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + n = 3.537742925 + 1.875 n = 3.537742925 + 1.875 Combine like terms: 3.537742925 + 1.875 = 5.412742925 n = 5.412742925 Simplifying n = 5.412742925

Subproblem 2

n + -1.875 = -3.537742925 Simplifying n + -1.875 = -3.537742925 Reorder the terms: -1.875 + n = -3.537742925 Solving -1.875 + n = -3.537742925 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + n = -3.537742925 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + n = -3.537742925 + 1.875 n = -3.537742925 + 1.875 Combine like terms: -3.537742925 + 1.875 = -1.662742925 n = -1.662742925 Simplifying n = -1.662742925

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.412742925, -1.662742925}

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