x^2+18x=79

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Solution for x^2+18x=79 equation:


Simplifying
x2 + 18x = 79

Reorder the terms:
18x + x2 = 79

Solving
18x + x2 = 79

Solving for variable 'x'.

Reorder the terms:
-79 + 18x + x2 = 79 + -79

Combine like terms: 79 + -79 = 0
-79 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '79' to each side of the equation.
-79 + 18x + 79 + x2 = 0 + 79

Reorder the terms:
-79 + 79 + 18x + x2 = 0 + 79

Combine like terms: -79 + 79 = 0
0 + 18x + x2 = 0 + 79
18x + x2 = 0 + 79

Combine like terms: 0 + 79 = 79
18x + x2 = 79

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 = 79 + 81

Reorder the terms:
81 + 18x + x2 = 79 + 81

Combine like terms: 79 + 81 = 160
81 + 18x + x2 = 160

Factor a perfect square on the left side:
(x + 9)(x + 9) = 160

Calculate the square root of the right side: 12.649110641

Break this problem into two subproblems by setting 
(x + 9) equal to 12.649110641 and -12.649110641.

Subproblem 1

x + 9 = 12.649110641 Simplifying x + 9 = 12.649110641 Reorder the terms: 9 + x = 12.649110641 Solving 9 + x = 12.649110641 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 = 12.649110641 + -9 Combine like terms: 9 + -9 = 0 0 + x = 12.649110641 + -9 x = 12.649110641 + -9 Combine like terms: 12.649110641 + -9 = 3.649110641 x = 3.649110641 Simplifying x = 3.649110641

Subproblem 2

x + 9 = -12.649110641 Simplifying x + 9 = -12.649110641 Reorder the terms: 9 + x = -12.649110641 Solving 9 + x = -12.649110641 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 = -12.649110641 + -9 Combine like terms: 9 + -9 = 0 0 + x = -12.649110641 + -9 x = -12.649110641 + -9 Combine like terms: -12.649110641 + -9 = -21.649110641 x = -21.649110641 Simplifying x = -21.649110641

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.649110641, -21.649110641}

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