n^2-14n-56=0

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Solution for n^2-14n-56=0 equation:


Simplifying
n2 + -14n + -56 = 0

Reorder the terms:
-56 + -14n + n2 = 0

Solving
-56 + -14n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + -14n + 56 + n2 = 0 + 56

Reorder the terms:
-56 + 56 + -14n + n2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + -14n + n2 = 0 + 56
-14n + n2 = 0 + 56

Combine like terms: 0 + 56 = 56
-14n + n2 = 56

The n term is -14n.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14n + 49 + n2 = 56 + 49

Reorder the terms:
49 + -14n + n2 = 56 + 49

Combine like terms: 56 + 49 = 105
49 + -14n + n2 = 105

Factor a perfect square on the left side:
(n + -7)(n + -7) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(n + -7) equal to 10.246950766 and -10.246950766.

Subproblem 1

n + -7 = 10.246950766 Simplifying n + -7 = 10.246950766 Reorder the terms: -7 + n = 10.246950766 Solving -7 + n = 10.246950766 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + n = 10.246950766 + 7 Combine like terms: -7 + 7 = 0 0 + n = 10.246950766 + 7 n = 10.246950766 + 7 Combine like terms: 10.246950766 + 7 = 17.246950766 n = 17.246950766 Simplifying n = 17.246950766

Subproblem 2

n + -7 = -10.246950766 Simplifying n + -7 = -10.246950766 Reorder the terms: -7 + n = -10.246950766 Solving -7 + n = -10.246950766 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + n = -10.246950766 + 7 Combine like terms: -7 + 7 = 0 0 + n = -10.246950766 + 7 n = -10.246950766 + 7 Combine like terms: -10.246950766 + 7 = -3.246950766 n = -3.246950766 Simplifying n = -3.246950766

Solution

The solution to the problem is based on the solutions from the subproblems. n = {17.246950766, -3.246950766}

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