3x^2-2-2x-4+2x^2+5x=

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Solution for 3x^2-2-2x-4+2x^2+5x= equation:


Simplifying
3x2 + -2 + -2x + -4 + 2x2 + 5x = 0

Reorder the terms:
-2 + -4 + -2x + 5x + 3x2 + 2x2 = 0

Combine like terms: -2 + -4 = -6
-6 + -2x + 5x + 3x2 + 2x2 = 0

Combine like terms: -2x + 5x = 3x
-6 + 3x + 3x2 + 2x2 = 0

Combine like terms: 3x2 + 2x2 = 5x2
-6 + 3x + 5x2 = 0

Solving
-6 + 3x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.2 + 0.6x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 0.6x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 0.6x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 0.6x + x2 = 0 + 1.2
0.6x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
0.6x + x2 = 1.2

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 = 1.2 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 1.2 + 0.09

Combine like terms: 1.2 + 0.09 = 1.29
0.09 + 0.6x + x2 = 1.29

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 1.29

Calculate the square root of the right side: 1.135781669

Break this problem into two subproblems by setting 
(x + 0.3) equal to 1.135781669 and -1.135781669.

Subproblem 1

x + 0.3 = 1.135781669 Simplifying x + 0.3 = 1.135781669 Reorder the terms: 0.3 + x = 1.135781669 Solving 0.3 + x = 1.135781669 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 = 1.135781669 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 1.135781669 + -0.3 x = 1.135781669 + -0.3 Combine like terms: 1.135781669 + -0.3 = 0.835781669 x = 0.835781669 Simplifying x = 0.835781669

Subproblem 2

x + 0.3 = -1.135781669 Simplifying x + 0.3 = -1.135781669 Reorder the terms: 0.3 + x = -1.135781669 Solving 0.3 + x = -1.135781669 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 = -1.135781669 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -1.135781669 + -0.3 x = -1.135781669 + -0.3 Combine like terms: -1.135781669 + -0.3 = -1.435781669 x = -1.435781669 Simplifying x = -1.435781669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.835781669, -1.435781669}

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