-4.9x^2+12x-0.8=0

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Solution for -4.9x^2+12x-0.8=0 equation:


Simplifying
-4.9x2 + 12x + -0.8 = 0

Reorder the terms:
-0.8 + 12x + -4.9x2 = 0

Solving
-0.8 + 12x + -4.9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
0.1632653061 + -2.448979592x + x2 = 0

Move the constant term to the right:

Add '-0.1632653061' to each side of the equation.
0.1632653061 + -2.448979592x + -0.1632653061 + x2 = 0 + -0.1632653061

Reorder the terms:
0.1632653061 + -0.1632653061 + -2.448979592x + x2 = 0 + -0.1632653061

Combine like terms: 0.1632653061 + -0.1632653061 = 0.0000000000
0.0000000000 + -2.448979592x + x2 = 0 + -0.1632653061
-2.448979592x + x2 = 0 + -0.1632653061

Combine like terms: 0 + -0.1632653061 = -0.1632653061
-2.448979592x + x2 = -0.1632653061

The x term is -2.448979592x.  Take half its coefficient (-1.224489796).
Square it (1.499375261) and add it to both sides.

Add '1.499375261' to each side of the equation.
-2.448979592x + 1.499375261 + x2 = -0.1632653061 + 1.499375261

Reorder the terms:
1.499375261 + -2.448979592x + x2 = -0.1632653061 + 1.499375261

Combine like terms: -0.1632653061 + 1.499375261 = 1.3361099549
1.499375261 + -2.448979592x + x2 = 1.3361099549

Factor a perfect square on the left side:
(x + -1.224489796)(x + -1.224489796) = 1.3361099549

Calculate the square root of the right side: 1.155902225

Break this problem into two subproblems by setting 
(x + -1.224489796) equal to 1.155902225 and -1.155902225.

Subproblem 1

x + -1.224489796 = 1.155902225 Simplifying x + -1.224489796 = 1.155902225 Reorder the terms: -1.224489796 + x = 1.155902225 Solving -1.224489796 + x = 1.155902225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + x = 1.155902225 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + x = 1.155902225 + 1.224489796 x = 1.155902225 + 1.224489796 Combine like terms: 1.155902225 + 1.224489796 = 2.380392021 x = 2.380392021 Simplifying x = 2.380392021

Subproblem 2

x + -1.224489796 = -1.155902225 Simplifying x + -1.224489796 = -1.155902225 Reorder the terms: -1.224489796 + x = -1.155902225 Solving -1.224489796 + x = -1.155902225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + x = -1.155902225 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + x = -1.155902225 + 1.224489796 x = -1.155902225 + 1.224489796 Combine like terms: -1.155902225 + 1.224489796 = 0.068587571 x = 0.068587571 Simplifying x = 0.068587571

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.380392021, 0.068587571}

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