x^2+120x-45=0

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Solution for x^2+120x-45=0 equation:


Simplifying
x2 + 120x + -45 = 0

Reorder the terms:
-45 + 120x + x2 = 0

Solving
-45 + 120x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 120x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 120x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 120x + x2 = 0 + 45
120x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
120x + x2 = 45

The x term is 120x.  Take half its coefficient (60).
Square it (3600) and add it to both sides.

Add '3600' to each side of the equation.
120x + 3600 + x2 = 45 + 3600

Reorder the terms:
3600 + 120x + x2 = 45 + 3600

Combine like terms: 45 + 3600 = 3645
3600 + 120x + x2 = 3645

Factor a perfect square on the left side:
(x + 60)(x + 60) = 3645

Calculate the square root of the right side: 60.373835392

Break this problem into two subproblems by setting 
(x + 60) equal to 60.373835392 and -60.373835392.

Subproblem 1

x + 60 = 60.373835392 Simplifying x + 60 = 60.373835392 Reorder the terms: 60 + x = 60.373835392 Solving 60 + x = 60.373835392 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-60' to each side of the equation. 60 + -60 + x = 60.373835392 + -60 Combine like terms: 60 + -60 = 0 0 + x = 60.373835392 + -60 x = 60.373835392 + -60 Combine like terms: 60.373835392 + -60 = 0.373835392 x = 0.373835392 Simplifying x = 0.373835392

Subproblem 2

x + 60 = -60.373835392 Simplifying x + 60 = -60.373835392 Reorder the terms: 60 + x = -60.373835392 Solving 60 + x = -60.373835392 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-60' to each side of the equation. 60 + -60 + x = -60.373835392 + -60 Combine like terms: 60 + -60 = 0 0 + x = -60.373835392 + -60 x = -60.373835392 + -60 Combine like terms: -60.373835392 + -60 = -120.373835392 x = -120.373835392 Simplifying x = -120.373835392

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.373835392, -120.373835392}

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