0=-4.9x^2+5x+1

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Solution for 0=-4.9x^2+5x+1 equation:


Simplifying
0 = -4.9x2 + 5x + 1

Reorder the terms:
0 = 1 + 5x + -4.9x2

Solving
0 = 1 + 5x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -1 = -1
-1 + -5x + 4.9x2 = 1 + 5x + -4.9x2 + -1 + -5x + 4.9x2

Reorder the terms:
-1 + -5x + 4.9x2 = 1 + -1 + 5x + -5x + -4.9x2 + 4.9x2

Combine like terms: 1 + -1 = 0
-1 + -5x + 4.9x2 = 0 + 5x + -5x + -4.9x2 + 4.9x2
-1 + -5x + 4.9x2 = 5x + -5x + -4.9x2 + 4.9x2

Combine like terms: 5x + -5x = 0
-1 + -5x + 4.9x2 = 0 + -4.9x2 + 4.9x2
-1 + -5x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-1 + -5x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
-0.2040816327 + -1.020408163x + x2 = 0

Move the constant term to the right:

Add '0.2040816327' to each side of the equation.
-0.2040816327 + -1.020408163x + 0.2040816327 + x2 = 0 + 0.2040816327

Reorder the terms:
-0.2040816327 + 0.2040816327 + -1.020408163x + x2 = 0 + 0.2040816327

Combine like terms: -0.2040816327 + 0.2040816327 = 0.0000000000
0.0000000000 + -1.020408163x + x2 = 0 + 0.2040816327
-1.020408163x + x2 = 0 + 0.2040816327

Combine like terms: 0 + 0.2040816327 = 0.2040816327
-1.020408163x + x2 = 0.2040816327

The x term is -1.020408163x.  Take half its coefficient (-0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
-1.020408163x + 0.2603082048 + x2 = 0.2040816327 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163x + x2 = 0.2040816327 + 0.2603082048

Combine like terms: 0.2040816327 + 0.2603082048 = 0.4643898375
0.2603082048 + -1.020408163x + x2 = 0.4643898375

Factor a perfect square on the left side:
(x + -0.5102040815)(x + -0.5102040815) = 0.4643898375

Calculate the square root of the right side: 0.681461545

Break this problem into two subproblems by setting 
(x + -0.5102040815) equal to 0.681461545 and -0.681461545.

Subproblem 1

x + -0.5102040815 = 0.681461545 Simplifying x + -0.5102040815 = 0.681461545 Reorder the terms: -0.5102040815 + x = 0.681461545 Solving -0.5102040815 + x = 0.681461545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + x = 0.681461545 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + x = 0.681461545 + 0.5102040815 x = 0.681461545 + 0.5102040815 Combine like terms: 0.681461545 + 0.5102040815 = 1.1916656265 x = 1.1916656265 Simplifying x = 1.1916656265

Subproblem 2

x + -0.5102040815 = -0.681461545 Simplifying x + -0.5102040815 = -0.681461545 Reorder the terms: -0.5102040815 + x = -0.681461545 Solving -0.5102040815 + x = -0.681461545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + x = -0.681461545 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + x = -0.681461545 + 0.5102040815 x = -0.681461545 + 0.5102040815 Combine like terms: -0.681461545 + 0.5102040815 = -0.1712574635 x = -0.1712574635 Simplifying x = -0.1712574635

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1916656265, -0.1712574635}

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