82=14x+4.9x^2

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Solution for 82=14x+4.9x^2 equation:


Simplifying
82 = 14x + 4.9x2

Solving
82 = 14x + 4.9x2

Solving for variable 'x'.

Reorder the terms:
82 + -14x + -4.9x2 = 14x + -14x + 4.9x2 + -4.9x2

Combine like terms: 14x + -14x = 0
82 + -14x + -4.9x2 = 0 + 4.9x2 + -4.9x2
82 + -14x + -4.9x2 = 4.9x2 + -4.9x2

Combine like terms: 4.9x2 + -4.9x2 = 0.0
82 + -14x + -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'.
-16.73469388 + 2.857142857x + x2 = 0

Move the constant term to the right:

Add '16.73469388' to each side of the equation.
-16.73469388 + 2.857142857x + 16.73469388 + x2 = 0 + 16.73469388

Reorder the terms:
-16.73469388 + 16.73469388 + 2.857142857x + x2 = 0 + 16.73469388

Combine like terms: -16.73469388 + 16.73469388 = 0.00000000
0.00000000 + 2.857142857x + x2 = 0 + 16.73469388
2.857142857x + x2 = 0 + 16.73469388

Combine like terms: 0 + 16.73469388 = 16.73469388
2.857142857x + x2 = 16.73469388

The x term is 2.857142857x.  Take half its coefficient (1.428571429).
Square it (2.040816328) and add it to both sides.

Add '2.040816328' to each side of the equation.
2.857142857x + 2.040816328 + x2 = 16.73469388 + 2.040816328

Reorder the terms:
2.040816328 + 2.857142857x + x2 = 16.73469388 + 2.040816328

Combine like terms: 16.73469388 + 2.040816328 = 18.775510208
2.040816328 + 2.857142857x + x2 = 18.775510208

Factor a perfect square on the left side:
(x + 1.428571429)(x + 1.428571429) = 18.775510208

Calculate the square root of the right side: 4.333071683

Break this problem into two subproblems by setting 
(x + 1.428571429) equal to 4.333071683 and -4.333071683.

Subproblem 1

x + 1.428571429 = 4.333071683 Simplifying x + 1.428571429 = 4.333071683 Reorder the terms: 1.428571429 + x = 4.333071683 Solving 1.428571429 + x = 4.333071683 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.428571429' to each side of the equation. 1.428571429 + -1.428571429 + x = 4.333071683 + -1.428571429 Combine like terms: 1.428571429 + -1.428571429 = 0.000000000 0.000000000 + x = 4.333071683 + -1.428571429 x = 4.333071683 + -1.428571429 Combine like terms: 4.333071683 + -1.428571429 = 2.904500254 x = 2.904500254 Simplifying x = 2.904500254

Subproblem 2

x + 1.428571429 = -4.333071683 Simplifying x + 1.428571429 = -4.333071683 Reorder the terms: 1.428571429 + x = -4.333071683 Solving 1.428571429 + x = -4.333071683 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.428571429' to each side of the equation. 1.428571429 + -1.428571429 + x = -4.333071683 + -1.428571429 Combine like terms: 1.428571429 + -1.428571429 = 0.000000000 0.000000000 + x = -4.333071683 + -1.428571429 x = -4.333071683 + -1.428571429 Combine like terms: -4.333071683 + -1.428571429 = -5.761643112 x = -5.761643112 Simplifying x = -5.761643112

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.904500254, -5.761643112}

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