0.2x^2-.4x-0.51=0

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Solution for 0.2x^2-.4x-0.51=0 equation:


Simplifying
0.2x2 + -0.4x + -0.51 = 0

Reorder the terms:
-0.51 + -0.4x + 0.2x2 = 0

Solving
-0.51 + -0.4x + 0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.2'.
-2.55 + -2x + x2 = 0

Move the constant term to the right:

Add '2.55' to each side of the equation.
-2.55 + -2x + 2.55 + x2 = 0 + 2.55

Reorder the terms:
-2.55 + 2.55 + -2x + x2 = 0 + 2.55

Combine like terms: -2.55 + 2.55 = 0.00
0.00 + -2x + x2 = 0 + 2.55
-2x + x2 = 0 + 2.55

Combine like terms: 0 + 2.55 = 2.55
-2x + x2 = 2.55

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 2.55 + 1

Reorder the terms:
1 + -2x + x2 = 2.55 + 1

Combine like terms: 2.55 + 1 = 3.55
1 + -2x + x2 = 3.55

Factor a perfect square on the left side:
(x + -1)(x + -1) = 3.55

Calculate the square root of the right side: 1.884144368

Break this problem into two subproblems by setting 
(x + -1) equal to 1.884144368 and -1.884144368.

Subproblem 1

x + -1 = 1.884144368 Simplifying x + -1 = 1.884144368 Reorder the terms: -1 + x = 1.884144368 Solving -1 + x = 1.884144368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.884144368 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.884144368 + 1 x = 1.884144368 + 1 Combine like terms: 1.884144368 + 1 = 2.884144368 x = 2.884144368 Simplifying x = 2.884144368

Subproblem 2

x + -1 = -1.884144368 Simplifying x + -1 = -1.884144368 Reorder the terms: -1 + x = -1.884144368 Solving -1 + x = -1.884144368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.884144368 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.884144368 + 1 x = -1.884144368 + 1 Combine like terms: -1.884144368 + 1 = -0.884144368 x = -0.884144368 Simplifying x = -0.884144368

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.884144368, -0.884144368}

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