-4.9x^2+19.6x+2=0

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Solution for -4.9x^2+19.6x+2=0 equation:


Simplifying
-4.9x2 + 19.6x + 2 = 0

Reorder the terms:
2 + 19.6x + -4.9x2 = 0

Solving
2 + 19.6x + -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'.
-0.4081632653 + -4x + x2 = 0

Move the constant term to the right:

Add '0.4081632653' to each side of the equation.
-0.4081632653 + -4x + 0.4081632653 + x2 = 0 + 0.4081632653

Reorder the terms:
-0.4081632653 + 0.4081632653 + -4x + x2 = 0 + 0.4081632653

Combine like terms: -0.4081632653 + 0.4081632653 = 0.0000000000
0.0000000000 + -4x + x2 = 0 + 0.4081632653
-4x + x2 = 0 + 0.4081632653

Combine like terms: 0 + 0.4081632653 = 0.4081632653
-4x + x2 = 0.4081632653

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 0.4081632653 + 4

Reorder the terms:
4 + -4x + x2 = 0.4081632653 + 4

Combine like terms: 0.4081632653 + 4 = 4.4081632653
4 + -4x + x2 = 4.4081632653

Factor a perfect square on the left side:
(x + -2)(x + -2) = 4.4081632653

Calculate the square root of the right side: 2.099562637

Break this problem into two subproblems by setting 
(x + -2) equal to 2.099562637 and -2.099562637.

Subproblem 1

x + -2 = 2.099562637 Simplifying x + -2 = 2.099562637 Reorder the terms: -2 + x = 2.099562637 Solving -2 + x = 2.099562637 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 2.099562637 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.099562637 + 2 x = 2.099562637 + 2 Combine like terms: 2.099562637 + 2 = 4.099562637 x = 4.099562637 Simplifying x = 4.099562637

Subproblem 2

x + -2 = -2.099562637 Simplifying x + -2 = -2.099562637 Reorder the terms: -2 + x = -2.099562637 Solving -2 + x = -2.099562637 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -2.099562637 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.099562637 + 2 x = -2.099562637 + 2 Combine like terms: -2.099562637 + 2 = -0.099562637 x = -0.099562637 Simplifying x = -0.099562637

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.099562637, -0.099562637}

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