n^2-3n-10=n+5

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Solution for n^2-3n-10=n+5 equation:


Simplifying
n2 + -3n + -10 = n + 5

Reorder the terms:
-10 + -3n + n2 = n + 5

Reorder the terms:
-10 + -3n + n2 = 5 + n

Solving
-10 + -3n + n2 = 5 + n

Solving for variable 'n'.

Reorder the terms:
-10 + -5 + -3n + -1n + n2 = 5 + n + -5 + -1n

Combine like terms: -10 + -5 = -15
-15 + -3n + -1n + n2 = 5 + n + -5 + -1n

Combine like terms: -3n + -1n = -4n
-15 + -4n + n2 = 5 + n + -5 + -1n

Reorder the terms:
-15 + -4n + n2 = 5 + -5 + n + -1n

Combine like terms: 5 + -5 = 0
-15 + -4n + n2 = 0 + n + -1n
-15 + -4n + n2 = n + -1n

Combine like terms: n + -1n = 0
-15 + -4n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -4n + 15 + n2 = 0 + 15

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

Combine like terms: -15 + 15 = 0
0 + -4n + n2 = 0 + 15
-4n + n2 = 0 + 15

Combine like terms: 0 + 15 = 15
-4n + n2 = 15

The n term is -4n.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4n + 4 + n2 = 15 + 4

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

Combine like terms: 15 + 4 = 19
4 + -4n + n2 = 19

Factor a perfect square on the left side:
(n + -2)(n + -2) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(n + -2) equal to 4.358898944 and -4.358898944.

Subproblem 1

n + -2 = 4.358898944 Simplifying n + -2 = 4.358898944 Reorder the terms: -2 + n = 4.358898944 Solving -2 + n = 4.358898944 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = 4.358898944 + 2 Combine like terms: -2 + 2 = 0 0 + n = 4.358898944 + 2 n = 4.358898944 + 2 Combine like terms: 4.358898944 + 2 = 6.358898944 n = 6.358898944 Simplifying n = 6.358898944

Subproblem 2

n + -2 = -4.358898944 Simplifying n + -2 = -4.358898944 Reorder the terms: -2 + n = -4.358898944 Solving -2 + n = -4.358898944 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = -4.358898944 + 2 Combine like terms: -2 + 2 = 0 0 + n = -4.358898944 + 2 n = -4.358898944 + 2 Combine like terms: -4.358898944 + 2 = -2.358898944 n = -2.358898944 Simplifying n = -2.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.358898944, -2.358898944}

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