x^2-72x-89=0

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Solution for x^2-72x-89=0 equation:


Simplifying
x2 + -72x + -89 = 0

Reorder the terms:
-89 + -72x + x2 = 0

Solving
-89 + -72x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '89' to each side of the equation.
-89 + -72x + 89 + x2 = 0 + 89

Reorder the terms:
-89 + 89 + -72x + x2 = 0 + 89

Combine like terms: -89 + 89 = 0
0 + -72x + x2 = 0 + 89
-72x + x2 = 0 + 89

Combine like terms: 0 + 89 = 89
-72x + x2 = 89

The x term is -72x.  Take half its coefficient (-36).
Square it (1296) and add it to both sides.

Add '1296' to each side of the equation.
-72x + 1296 + x2 = 89 + 1296

Reorder the terms:
1296 + -72x + x2 = 89 + 1296

Combine like terms: 89 + 1296 = 1385
1296 + -72x + x2 = 1385

Factor a perfect square on the left side:
(x + -36)(x + -36) = 1385

Calculate the square root of the right side: 37.215588132

Break this problem into two subproblems by setting 
(x + -36) equal to 37.215588132 and -37.215588132.

Subproblem 1

x + -36 = 37.215588132 Simplifying x + -36 = 37.215588132 Reorder the terms: -36 + x = 37.215588132 Solving -36 + x = 37.215588132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + x = 37.215588132 + 36 Combine like terms: -36 + 36 = 0 0 + x = 37.215588132 + 36 x = 37.215588132 + 36 Combine like terms: 37.215588132 + 36 = 73.215588132 x = 73.215588132 Simplifying x = 73.215588132

Subproblem 2

x + -36 = -37.215588132 Simplifying x + -36 = -37.215588132 Reorder the terms: -36 + x = -37.215588132 Solving -36 + x = -37.215588132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + x = -37.215588132 + 36 Combine like terms: -36 + 36 = 0 0 + x = -37.215588132 + 36 x = -37.215588132 + 36 Combine like terms: -37.215588132 + 36 = -1.215588132 x = -1.215588132 Simplifying x = -1.215588132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {73.215588132, -1.215588132}

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