x^2+36x=720

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Solution for x^2+36x=720 equation:


Simplifying
x2 + 36x = 720

Reorder the terms:
36x + x2 = 720

Solving
36x + x2 = 720

Solving for variable 'x'.

Reorder the terms:
-720 + 36x + x2 = 720 + -720

Combine like terms: 720 + -720 = 0
-720 + 36x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '720' to each side of the equation.
-720 + 36x + 720 + x2 = 0 + 720

Reorder the terms:
-720 + 720 + 36x + x2 = 0 + 720

Combine like terms: -720 + 720 = 0
0 + 36x + x2 = 0 + 720
36x + x2 = 0 + 720

Combine like terms: 0 + 720 = 720
36x + x2 = 720

The x term is 36x.  Take half its coefficient (18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
36x + 324 + x2 = 720 + 324

Reorder the terms:
324 + 36x + x2 = 720 + 324

Combine like terms: 720 + 324 = 1044
324 + 36x + x2 = 1044

Factor a perfect square on the left side:
(x + 18)(x + 18) = 1044

Calculate the square root of the right side: 32.310988843

Break this problem into two subproblems by setting 
(x + 18) equal to 32.310988843 and -32.310988843.

Subproblem 1

x + 18 = 32.310988843 Simplifying x + 18 = 32.310988843 Reorder the terms: 18 + x = 32.310988843 Solving 18 + x = 32.310988843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = 32.310988843 + -18 Combine like terms: 18 + -18 = 0 0 + x = 32.310988843 + -18 x = 32.310988843 + -18 Combine like terms: 32.310988843 + -18 = 14.310988843 x = 14.310988843 Simplifying x = 14.310988843

Subproblem 2

x + 18 = -32.310988843 Simplifying x + 18 = -32.310988843 Reorder the terms: 18 + x = -32.310988843 Solving 18 + x = -32.310988843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = -32.310988843 + -18 Combine like terms: 18 + -18 = 0 0 + x = -32.310988843 + -18 x = -32.310988843 + -18 Combine like terms: -32.310988843 + -18 = -50.310988843 x = -50.310988843 Simplifying x = -50.310988843

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.310988843, -50.310988843}

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