x^2+x*0.2=120

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Solution for x^2+x*0.2=120 equation:


Simplifying
x2 + x * 0.2 = 120

Reorder the terms for easier multiplication:
x2 + 0.2x = 120

Reorder the terms:
0.2x + x2 = 120

Solving
0.2x + x2 = 120

Solving for variable 'x'.

Reorder the terms:
-120 + 0.2x + x2 = 120 + -120

Combine like terms: 120 + -120 = 0
-120 + 0.2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 0.2x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 0.2x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 0.2x + x2 = 0 + 120
0.2x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
0.2x + x2 = 120

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 120 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 120 + 0.01

Combine like terms: 120 + 0.01 = 120.01
0.01 + 0.2x + x2 = 120.01

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 120.01

Calculate the square root of the right side: 10.954907576

Break this problem into two subproblems by setting 
(x + 0.1) equal to 10.954907576 and -10.954907576.

Subproblem 1

x + 0.1 = 10.954907576 Simplifying x + 0.1 = 10.954907576 Reorder the terms: 0.1 + x = 10.954907576 Solving 0.1 + x = 10.954907576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 10.954907576 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 10.954907576 + -0.1 x = 10.954907576 + -0.1 Combine like terms: 10.954907576 + -0.1 = 10.854907576 x = 10.854907576 Simplifying x = 10.854907576

Subproblem 2

x + 0.1 = -10.954907576 Simplifying x + 0.1 = -10.954907576 Reorder the terms: 0.1 + x = -10.954907576 Solving 0.1 + x = -10.954907576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -10.954907576 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -10.954907576 + -0.1 x = -10.954907576 + -0.1 Combine like terms: -10.954907576 + -0.1 = -11.054907576 x = -11.054907576 Simplifying x = -11.054907576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.854907576, -11.054907576}

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