x^2+18x-59=0

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Solution for x^2+18x-59=0 equation:


Simplifying
x2 + 18x + -59 = 0

Reorder the terms:
-59 + 18x + x2 = 0

Solving
-59 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '59' to each side of the equation.
-59 + 18x + 59 + x2 = 0 + 59

Reorder the terms:
-59 + 59 + 18x + x2 = 0 + 59

Combine like terms: -59 + 59 = 0
0 + 18x + x2 = 0 + 59
18x + x2 = 0 + 59

Combine like terms: 0 + 59 = 59
18x + x2 = 59

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 59 + 81

Reorder the terms:
81 + 18x + x2 = 59 + 81

Combine like terms: 59 + 81 = 140
81 + 18x + x2 = 140

Factor a perfect square on the left side:
(x + 9)(x + 9) = 140

Calculate the square root of the right side: 11.832159566

Break this problem into two subproblems by setting 
(x + 9) equal to 11.832159566 and -11.832159566.

Subproblem 1

x + 9 = 11.832159566 Simplifying x + 9 = 11.832159566 Reorder the terms: 9 + x = 11.832159566 Solving 9 + x = 11.832159566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 11.832159566 + -9 Combine like terms: 9 + -9 = 0 0 + x = 11.832159566 + -9 x = 11.832159566 + -9 Combine like terms: 11.832159566 + -9 = 2.832159566 x = 2.832159566 Simplifying x = 2.832159566

Subproblem 2

x + 9 = -11.832159566 Simplifying x + 9 = -11.832159566 Reorder the terms: 9 + x = -11.832159566 Solving 9 + x = -11.832159566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -11.832159566 + -9 Combine like terms: 9 + -9 = 0 0 + x = -11.832159566 + -9 x = -11.832159566 + -9 Combine like terms: -11.832159566 + -9 = -20.832159566 x = -20.832159566 Simplifying x = -20.832159566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.832159566, -20.832159566}

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