x=2x^2-5x-3

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


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

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

Solving
x = -3 + -5x + 2x2

Solving for variable 'x'.

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

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

Reorder the terms:
3 + 6x + -2x2 = -3 + 3 + -5x + 5x + 2x2 + -2x2

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

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

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

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

Divide each side by '-2'.
-1.5 + -3x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -3x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -3x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -3x + x2 = 0 + 1.5
-3x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-3x + x2 = 1.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 1.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 1.5 + 2.25

Combine like terms: 1.5 + 2.25 = 3.75
2.25 + -3x + x2 = 3.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 3.75

Calculate the square root of the right side: 1.936491673

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.936491673 and -1.936491673.

Subproblem 1

x + -1.5 = 1.936491673 Simplifying x + -1.5 = 1.936491673 Reorder the terms: -1.5 + x = 1.936491673 Solving -1.5 + x = 1.936491673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.936491673 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.936491673 + 1.5 x = 1.936491673 + 1.5 Combine like terms: 1.936491673 + 1.5 = 3.436491673 x = 3.436491673 Simplifying x = 3.436491673

Subproblem 2

x + -1.5 = -1.936491673 Simplifying x + -1.5 = -1.936491673 Reorder the terms: -1.5 + x = -1.936491673 Solving -1.5 + x = -1.936491673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.936491673 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.936491673 + 1.5 x = -1.936491673 + 1.5 Combine like terms: -1.936491673 + 1.5 = -0.436491673 x = -0.436491673 Simplifying x = -0.436491673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.436491673, -0.436491673}

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