4.9x^2+5x-5=0

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


Simplifying
4.9x2 + 5x + -5 = 0

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

Solving
-5 + 5x + 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'.
-1.020408163 + 1.020408163x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -1.020408163 + 1.020408163 = 0.000000000
0.000000000 + 1.020408163x + x2 = 0 + 1.020408163
1.020408163x + x2 = 0 + 1.020408163

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

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 = 1.020408163 + 0.2603082048

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

Combine like terms: 1.020408163 + 0.2603082048 = 1.2807163678
0.2603082048 + 1.020408163x + x2 = 1.2807163678

Factor a perfect square on the left side:
(x + 0.5102040815)(x + 0.5102040815) = 1.2807163678

Calculate the square root of the right side: 1.131687398

Break this problem into two subproblems by setting 
(x + 0.5102040815) equal to 1.131687398 and -1.131687398.

Subproblem 1

x + 0.5102040815 = 1.131687398 Simplifying x + 0.5102040815 = 1.131687398 Reorder the terms: 0.5102040815 + x = 1.131687398 Solving 0.5102040815 + x = 1.131687398 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 = 1.131687398 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + x = 1.131687398 + -0.5102040815 x = 1.131687398 + -0.5102040815 Combine like terms: 1.131687398 + -0.5102040815 = 0.6214833165 x = 0.6214833165 Simplifying x = 0.6214833165

Subproblem 2

x + 0.5102040815 = -1.131687398 Simplifying x + 0.5102040815 = -1.131687398 Reorder the terms: 0.5102040815 + x = -1.131687398 Solving 0.5102040815 + x = -1.131687398 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 = -1.131687398 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + x = -1.131687398 + -0.5102040815 x = -1.131687398 + -0.5102040815 Combine like terms: -1.131687398 + -0.5102040815 = -1.6418914795 x = -1.6418914795 Simplifying x = -1.6418914795

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6214833165, -1.6418914795}

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