-4.905x^2-1.11x+0.8=0

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Solution for -4.905x^2-1.11x+0.8=0 equation:


Simplifying
-4.905x2 + -1.11x + 0.8 = 0

Reorder the terms:
0.8 + -1.11x + -4.905x2 = 0

Solving
0.8 + -1.11x + -4.905x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.905 the coefficient of the squared term: 

Divide each side by '-4.905'.
-0.1630988787 + 0.2262996942x + x2 = 0

Move the constant term to the right:

Add '0.1630988787' to each side of the equation.
-0.1630988787 + 0.2262996942x + 0.1630988787 + x2 = 0 + 0.1630988787

Reorder the terms:
-0.1630988787 + 0.1630988787 + 0.2262996942x + x2 = 0 + 0.1630988787

Combine like terms: -0.1630988787 + 0.1630988787 = 0.0000000000
0.0000000000 + 0.2262996942x + x2 = 0 + 0.1630988787
0.2262996942x + x2 = 0 + 0.1630988787

Combine like terms: 0 + 0.1630988787 = 0.1630988787
0.2262996942x + x2 = 0.1630988787

The x term is 0.2262996942x.  Take half its coefficient (0.1131498471).
Square it (0.01280288790) and add it to both sides.

Add '0.01280288790' to each side of the equation.
0.2262996942x + 0.01280288790 + x2 = 0.1630988787 + 0.01280288790

Reorder the terms:
0.01280288790 + 0.2262996942x + x2 = 0.1630988787 + 0.01280288790

Combine like terms: 0.1630988787 + 0.01280288790 = 0.1759017666
0.01280288790 + 0.2262996942x + x2 = 0.1759017666

Factor a perfect square on the left side:
(x + 0.1131498471)(x + 0.1131498471) = 0.1759017666

Calculate the square root of the right side: 0.419406446

Break this problem into two subproblems by setting 
(x + 0.1131498471) equal to 0.419406446 and -0.419406446.

Subproblem 1

x + 0.1131498471 = 0.419406446 Simplifying x + 0.1131498471 = 0.419406446 Reorder the terms: 0.1131498471 + x = 0.419406446 Solving 0.1131498471 + x = 0.419406446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1131498471' to each side of the equation. 0.1131498471 + -0.1131498471 + x = 0.419406446 + -0.1131498471 Combine like terms: 0.1131498471 + -0.1131498471 = 0.0000000000 0.0000000000 + x = 0.419406446 + -0.1131498471 x = 0.419406446 + -0.1131498471 Combine like terms: 0.419406446 + -0.1131498471 = 0.3062565989 x = 0.3062565989 Simplifying x = 0.3062565989

Subproblem 2

x + 0.1131498471 = -0.419406446 Simplifying x + 0.1131498471 = -0.419406446 Reorder the terms: 0.1131498471 + x = -0.419406446 Solving 0.1131498471 + x = -0.419406446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1131498471' to each side of the equation. 0.1131498471 + -0.1131498471 + x = -0.419406446 + -0.1131498471 Combine like terms: 0.1131498471 + -0.1131498471 = 0.0000000000 0.0000000000 + x = -0.419406446 + -0.1131498471 x = -0.419406446 + -0.1131498471 Combine like terms: -0.419406446 + -0.1131498471 = -0.5325562931 x = -0.5325562931 Simplifying x = -0.5325562931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3062565989, -0.5325562931}

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