0=-4.9x^2+14.79x-2

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Solution for 0=-4.9x^2+14.79x-2 equation:


Simplifying
0 = -4.9x2 + 14.79x + -2

Reorder the terms:
0 = -2 + 14.79x + -4.9x2

Solving
0 = -2 + 14.79x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + 2 = 2
2 + -14.79x + 4.9x2 = -2 + 14.79x + -4.9x2 + 2 + -14.79x + 4.9x2

Reorder the terms:
2 + -14.79x + 4.9x2 = -2 + 2 + 14.79x + -14.79x + -4.9x2 + 4.9x2

Combine like terms: -2 + 2 = 0
2 + -14.79x + 4.9x2 = 0 + 14.79x + -14.79x + -4.9x2 + 4.9x2
2 + -14.79x + 4.9x2 = 14.79x + -14.79x + -4.9x2 + 4.9x2

Combine like terms: 14.79x + -14.79x = 0.00
2 + -14.79x + 4.9x2 = 0.00 + -4.9x2 + 4.9x2
2 + -14.79x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
2 + -14.79x + 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'.
0.4081632653 + -3.018367347x + x2 = 0

Move the constant term to the right:

Add '-0.4081632653' to each side of the equation.
0.4081632653 + -3.018367347x + -0.4081632653 + x2 = 0 + -0.4081632653

Reorder the terms:
0.4081632653 + -0.4081632653 + -3.018367347x + x2 = 0 + -0.4081632653

Combine like terms: 0.4081632653 + -0.4081632653 = 0.0000000000
0.0000000000 + -3.018367347x + x2 = 0 + -0.4081632653
-3.018367347x + x2 = 0 + -0.4081632653

Combine like terms: 0 + -0.4081632653 = -0.4081632653
-3.018367347x + x2 = -0.4081632653

The x term is -3.018367347x.  Take half its coefficient (-1.509183674).
Square it (2.277635362) and add it to both sides.

Add '2.277635362' to each side of the equation.
-3.018367347x + 2.277635362 + x2 = -0.4081632653 + 2.277635362

Reorder the terms:
2.277635362 + -3.018367347x + x2 = -0.4081632653 + 2.277635362

Combine like terms: -0.4081632653 + 2.277635362 = 1.8694720967
2.277635362 + -3.018367347x + x2 = 1.8694720967

Factor a perfect square on the left side:
(x + -1.509183674)(x + -1.509183674) = 1.8694720967

Calculate the square root of the right side: 1.367286399

Break this problem into two subproblems by setting 
(x + -1.509183674) equal to 1.367286399 and -1.367286399.

Subproblem 1

x + -1.509183674 = 1.367286399 Simplifying x + -1.509183674 = 1.367286399 Reorder the terms: -1.509183674 + x = 1.367286399 Solving -1.509183674 + x = 1.367286399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.509183674' to each side of the equation. -1.509183674 + 1.509183674 + x = 1.367286399 + 1.509183674 Combine like terms: -1.509183674 + 1.509183674 = 0.000000000 0.000000000 + x = 1.367286399 + 1.509183674 x = 1.367286399 + 1.509183674 Combine like terms: 1.367286399 + 1.509183674 = 2.876470073 x = 2.876470073 Simplifying x = 2.876470073

Subproblem 2

x + -1.509183674 = -1.367286399 Simplifying x + -1.509183674 = -1.367286399 Reorder the terms: -1.509183674 + x = -1.367286399 Solving -1.509183674 + x = -1.367286399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.509183674' to each side of the equation. -1.509183674 + 1.509183674 + x = -1.367286399 + 1.509183674 Combine like terms: -1.509183674 + 1.509183674 = 0.000000000 0.000000000 + x = -1.367286399 + 1.509183674 x = -1.367286399 + 1.509183674 Combine like terms: -1.367286399 + 1.509183674 = 0.141897275 x = 0.141897275 Simplifying x = 0.141897275

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.876470073, 0.141897275}

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