n^2-2n-70=0

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Solution for n^2-2n-70=0 equation:


Simplifying
n2 + -2n + -70 = 0

Reorder the terms:
-70 + -2n + n2 = 0

Solving
-70 + -2n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -2n + 70 + n2 = 0 + 70

Reorder the terms:
-70 + 70 + -2n + n2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -2n + n2 = 0 + 70
-2n + n2 = 0 + 70

Combine like terms: 0 + 70 = 70
-2n + n2 = 70

The n term is -2n.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2n + 1 + n2 = 70 + 1

Reorder the terms:
1 + -2n + n2 = 70 + 1

Combine like terms: 70 + 1 = 71
1 + -2n + n2 = 71

Factor a perfect square on the left side:
(n + -1)(n + -1) = 71

Calculate the square root of the right side: 8.426149773

Break this problem into two subproblems by setting 
(n + -1) equal to 8.426149773 and -8.426149773.

Subproblem 1

n + -1 = 8.426149773 Simplifying n + -1 = 8.426149773 Reorder the terms: -1 + n = 8.426149773 Solving -1 + n = 8.426149773 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = 8.426149773 + 1 Combine like terms: -1 + 1 = 0 0 + n = 8.426149773 + 1 n = 8.426149773 + 1 Combine like terms: 8.426149773 + 1 = 9.426149773 n = 9.426149773 Simplifying n = 9.426149773

Subproblem 2

n + -1 = -8.426149773 Simplifying n + -1 = -8.426149773 Reorder the terms: -1 + n = -8.426149773 Solving -1 + n = -8.426149773 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = -8.426149773 + 1 Combine like terms: -1 + 1 = 0 0 + n = -8.426149773 + 1 n = -8.426149773 + 1 Combine like terms: -8.426149773 + 1 = -7.426149773 n = -7.426149773 Simplifying n = -7.426149773

Solution

The solution to the problem is based on the solutions from the subproblems. n = {9.426149773, -7.426149773}

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