2x^2+.02x-120=0

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Solution for 2x^2+.02x-120=0 equation:


Simplifying
2x2 + 0.02x + -120 = 0

Reorder the terms:
-120 + 0.02x + 2x2 = 0

Solving
-120 + 0.02x + 2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-60 + 0.01x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 0.01x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 0.01x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 0.01x + x2 = 0 + 60
0.01x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
0.01x + x2 = 60

The x term is 0.01x.  Take half its coefficient (0.005).
Square it (0.000025) and add it to both sides.

Add '0.000025' to each side of the equation.
0.01x + 0.000025 + x2 = 60 + 0.000025

Reorder the terms:
0.000025 + 0.01x + x2 = 60 + 0.000025

Combine like terms: 60 + 0.000025 = 60.000025
0.000025 + 0.01x + x2 = 60.000025

Factor a perfect square on the left side:
(x + 0.005)(x + 0.005) = 60.000025

Calculate the square root of the right side: 7.745968306

Break this problem into two subproblems by setting 
(x + 0.005) equal to 7.745968306 and -7.745968306.

Subproblem 1

x + 0.005 = 7.745968306 Simplifying x + 0.005 = 7.745968306 Reorder the terms: 0.005 + x = 7.745968306 Solving 0.005 + x = 7.745968306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.005' to each side of the equation. 0.005 + -0.005 + x = 7.745968306 + -0.005 Combine like terms: 0.005 + -0.005 = 0.000 0.000 + x = 7.745968306 + -0.005 x = 7.745968306 + -0.005 Combine like terms: 7.745968306 + -0.005 = 7.740968306 x = 7.740968306 Simplifying x = 7.740968306

Subproblem 2

x + 0.005 = -7.745968306 Simplifying x + 0.005 = -7.745968306 Reorder the terms: 0.005 + x = -7.745968306 Solving 0.005 + x = -7.745968306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.005' to each side of the equation. 0.005 + -0.005 + x = -7.745968306 + -0.005 Combine like terms: 0.005 + -0.005 = 0.000 0.000 + x = -7.745968306 + -0.005 x = -7.745968306 + -0.005 Combine like terms: -7.745968306 + -0.005 = -7.750968306 x = -7.750968306 Simplifying x = -7.750968306

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.740968306, -7.750968306}

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