-0.6x^2+5.1x+2=0

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Solution for -0.6x^2+5.1x+2=0 equation:


Simplifying
-0.6x2 + 5.1x + 2 = 0

Reorder the terms:
2 + 5.1x + -0.6x2 = 0

Solving
2 + 5.1x + -0.6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
-3.333333333 + -8.5x + x2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -8.5x + 3.333333333 + x2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -8.5x + x2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -8.5x + x2 = 0 + 3.333333333
-8.5x + x2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-8.5x + x2 = 3.333333333

The x term is -8.5x.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5x + 18.0625 + x2 = 3.333333333 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = 3.333333333 + 18.0625

Combine like terms: 3.333333333 + 18.0625 = 21.395833333
18.0625 + -8.5x + x2 = 21.395833333

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 21.395833333

Calculate the square root of the right side: 4.625563029

Break this problem into two subproblems by setting 
(x + -4.25) equal to 4.625563029 and -4.625563029.

Subproblem 1

x + -4.25 = 4.625563029 Simplifying x + -4.25 = 4.625563029 Reorder the terms: -4.25 + x = 4.625563029 Solving -4.25 + x = 4.625563029 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = 4.625563029 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 4.625563029 + 4.25 x = 4.625563029 + 4.25 Combine like terms: 4.625563029 + 4.25 = 8.875563029 x = 8.875563029 Simplifying x = 8.875563029

Subproblem 2

x + -4.25 = -4.625563029 Simplifying x + -4.25 = -4.625563029 Reorder the terms: -4.25 + x = -4.625563029 Solving -4.25 + x = -4.625563029 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = -4.625563029 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -4.625563029 + 4.25 x = -4.625563029 + 4.25 Combine like terms: -4.625563029 + 4.25 = -0.375563029 x = -0.375563029 Simplifying x = -0.375563029

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.875563029, -0.375563029}

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