4.9x^2-5.6x+1.6=0

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Solution for 4.9x^2-5.6x+1.6=0 equation:


Simplifying
4.9x2 + -5.6x + 1.6 = 0

Reorder the terms:
1.6 + -5.6x + 4.9x2 = 0

Solving
1.6 + -5.6x + 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'.
0.3265306122 + -1.142857143x + x2 = 0

Move the constant term to the right:

Add '-0.3265306122' to each side of the equation.
0.3265306122 + -1.142857143x + -0.3265306122 + x2 = 0 + -0.3265306122

Reorder the terms:
0.3265306122 + -0.3265306122 + -1.142857143x + x2 = 0 + -0.3265306122

Combine like terms: 0.3265306122 + -0.3265306122 = 0.0000000000
0.0000000000 + -1.142857143x + x2 = 0 + -0.3265306122
-1.142857143x + x2 = 0 + -0.3265306122

Combine like terms: 0 + -0.3265306122 = -0.3265306122
-1.142857143x + x2 = -0.3265306122

The x term is -1.142857143x.  Take half its coefficient (-0.5714285715).
Square it (0.3265306123) and add it to both sides.

Add '0.3265306123' to each side of the equation.
-1.142857143x + 0.3265306123 + x2 = -0.3265306122 + 0.3265306123

Reorder the terms:
0.3265306123 + -1.142857143x + x2 = -0.3265306122 + 0.3265306123

Combine like terms: -0.3265306122 + 0.3265306123 = 0.0000000001
0.3265306123 + -1.142857143x + x2 = 0.0000000001

Factor a perfect square on the left side:
(x + -0.5714285715)(x + -0.5714285715) = 0.0000000001

Calculate the square root of the right side: 0.00001

Break this problem into two subproblems by setting 
(x + -0.5714285715) equal to 0.00001 and -0.00001.

Subproblem 1

x + -0.5714285715 = 0.00001 Simplifying x + -0.5714285715 = 0.00001 Reorder the terms: -0.5714285715 + x = 0.00001 Solving -0.5714285715 + x = 0.00001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5714285715' to each side of the equation. -0.5714285715 + 0.5714285715 + x = 0.00001 + 0.5714285715 Combine like terms: -0.5714285715 + 0.5714285715 = 0.0000000000 0.0000000000 + x = 0.00001 + 0.5714285715 x = 0.00001 + 0.5714285715 Combine like terms: 0.00001 + 0.5714285715 = 0.5714385715 x = 0.5714385715 Simplifying x = 0.5714385715

Subproblem 2

x + -0.5714285715 = -0.00001 Simplifying x + -0.5714285715 = -0.00001 Reorder the terms: -0.5714285715 + x = -0.00001 Solving -0.5714285715 + x = -0.00001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5714285715' to each side of the equation. -0.5714285715 + 0.5714285715 + x = -0.00001 + 0.5714285715 Combine like terms: -0.5714285715 + 0.5714285715 = 0.0000000000 0.0000000000 + x = -0.00001 + 0.5714285715 x = -0.00001 + 0.5714285715 Combine like terms: -0.00001 + 0.5714285715 = 0.5714185715 x = 0.5714185715 Simplifying x = 0.5714185715

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5714385715, 0.5714185715}

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