4.9x^2+9.1x+1.4=0

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Solution for 4.9x^2+9.1x+1.4=0 equation:


Simplifying
4.9x2 + 9.1x + 1.4 = 0

Reorder the terms:
1.4 + 9.1x + 4.9x2 = 0

Solving
1.4 + 9.1x + 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'.
0.2857142857 + 1.857142857x + x2 = 0

Move the constant term to the right:

Add '-0.2857142857' to each side of the equation.
0.2857142857 + 1.857142857x + -0.2857142857 + x2 = 0 + -0.2857142857

Reorder the terms:
0.2857142857 + -0.2857142857 + 1.857142857x + x2 = 0 + -0.2857142857

Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000
0.0000000000 + 1.857142857x + x2 = 0 + -0.2857142857
1.857142857x + x2 = 0 + -0.2857142857

Combine like terms: 0 + -0.2857142857 = -0.2857142857
1.857142857x + x2 = -0.2857142857

The x term is 1.857142857x.  Take half its coefficient (0.9285714285).
Square it (0.8622448978) and add it to both sides.

Add '0.8622448978' to each side of the equation.
1.857142857x + 0.8622448978 + x2 = -0.2857142857 + 0.8622448978

Reorder the terms:
0.8622448978 + 1.857142857x + x2 = -0.2857142857 + 0.8622448978

Combine like terms: -0.2857142857 + 0.8622448978 = 0.5765306121
0.8622448978 + 1.857142857x + x2 = 0.5765306121

Factor a perfect square on the left side:
(x + 0.9285714285)(x + 0.9285714285) = 0.5765306121

Calculate the square root of the right side: 0.759296129

Break this problem into two subproblems by setting 
(x + 0.9285714285) equal to 0.759296129 and -0.759296129.

Subproblem 1

x + 0.9285714285 = 0.759296129 Simplifying x + 0.9285714285 = 0.759296129 Reorder the terms: 0.9285714285 + x = 0.759296129 Solving 0.9285714285 + x = 0.759296129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9285714285' to each side of the equation. 0.9285714285 + -0.9285714285 + x = 0.759296129 + -0.9285714285 Combine like terms: 0.9285714285 + -0.9285714285 = 0.0000000000 0.0000000000 + x = 0.759296129 + -0.9285714285 x = 0.759296129 + -0.9285714285 Combine like terms: 0.759296129 + -0.9285714285 = -0.1692752995 x = -0.1692752995 Simplifying x = -0.1692752995

Subproblem 2

x + 0.9285714285 = -0.759296129 Simplifying x + 0.9285714285 = -0.759296129 Reorder the terms: 0.9285714285 + x = -0.759296129 Solving 0.9285714285 + x = -0.759296129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9285714285' to each side of the equation. 0.9285714285 + -0.9285714285 + x = -0.759296129 + -0.9285714285 Combine like terms: 0.9285714285 + -0.9285714285 = 0.0000000000 0.0000000000 + x = -0.759296129 + -0.9285714285 x = -0.759296129 + -0.9285714285 Combine like terms: -0.759296129 + -0.9285714285 = -1.6878675575 x = -1.6878675575 Simplifying x = -1.6878675575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.1692752995, -1.6878675575}

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