2x^2+1.2x-212=0

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Solution for 2x^2+1.2x-212=0 equation:


Simplifying
2x2 + 1.2x + -212 = 0

Reorder the terms:
-212 + 1.2x + 2x2 = 0

Solving
-212 + 1.2x + 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'.
-106 + 0.6x + x2 = 0

Move the constant term to the right:

Add '106' to each side of the equation.
-106 + 0.6x + 106 + x2 = 0 + 106

Reorder the terms:
-106 + 106 + 0.6x + x2 = 0 + 106

Combine like terms: -106 + 106 = 0
0 + 0.6x + x2 = 0 + 106
0.6x + x2 = 0 + 106

Combine like terms: 0 + 106 = 106
0.6x + x2 = 106

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 106 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 106 + 0.09

Combine like terms: 106 + 0.09 = 106.09
0.09 + 0.6x + x2 = 106.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 106.09

Calculate the square root of the right side: 10.3

Break this problem into two subproblems by setting 
(x + 0.3) equal to 10.3 and -10.3.

Subproblem 1

x + 0.3 = 10.3 Simplifying x + 0.3 = 10.3 Reorder the terms: 0.3 + x = 10.3 Solving 0.3 + x = 10.3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 10.3 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 10.3 + -0.3 x = 10.3 + -0.3 Combine like terms: 10.3 + -0.3 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + 0.3 = -10.3 Simplifying x + 0.3 = -10.3 Reorder the terms: 0.3 + x = -10.3 Solving 0.3 + x = -10.3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -10.3 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -10.3 + -0.3 x = -10.3 + -0.3 Combine like terms: -10.3 + -0.3 = -10.6 x = -10.6 Simplifying x = -10.6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -10.6}

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