8=70x+4.9x^2

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Solution for 8=70x+4.9x^2 equation:


Simplifying
8 = 70x + 4.9x2

Solving
8 = 70x + 4.9x2

Solving for variable 'x'.

Reorder the terms:
8 + -70x + -4.9x2 = 70x + -70x + 4.9x2 + -4.9x2

Combine like terms: 70x + -70x = 0
8 + -70x + -4.9x2 = 0 + 4.9x2 + -4.9x2
8 + -70x + -4.9x2 = 4.9x2 + -4.9x2

Combine like terms: 4.9x2 + -4.9x2 = 0.0
8 + -70x + -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'.
-1.632653061 + 14.28571429x + x2 = 0

Move the constant term to the right:

Add '1.632653061' to each side of the equation.
-1.632653061 + 14.28571429x + 1.632653061 + x2 = 0 + 1.632653061

Reorder the terms:
-1.632653061 + 1.632653061 + 14.28571429x + x2 = 0 + 1.632653061

Combine like terms: -1.632653061 + 1.632653061 = 0.000000000
0.000000000 + 14.28571429x + x2 = 0 + 1.632653061
14.28571429x + x2 = 0 + 1.632653061

Combine like terms: 0 + 1.632653061 = 1.632653061
14.28571429x + x2 = 1.632653061

The x term is 14.28571429x.  Take half its coefficient (7.142857145).
Square it (51.02040819) and add it to both sides.

Add '51.02040819' to each side of the equation.
14.28571429x + 51.02040819 + x2 = 1.632653061 + 51.02040819

Reorder the terms:
51.02040819 + 14.28571429x + x2 = 1.632653061 + 51.02040819

Combine like terms: 1.632653061 + 51.02040819 = 52.653061251
51.02040819 + 14.28571429x + x2 = 52.653061251

Factor a perfect square on the left side:
(x + 7.142857145)(x + 7.142857145) = 52.653061251

Calculate the square root of the right side: 7.256242916

Break this problem into two subproblems by setting 
(x + 7.142857145) equal to 7.256242916 and -7.256242916.

Subproblem 1

x + 7.142857145 = 7.256242916 Simplifying x + 7.142857145 = 7.256242916 Reorder the terms: 7.142857145 + x = 7.256242916 Solving 7.142857145 + x = 7.256242916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.142857145' to each side of the equation. 7.142857145 + -7.142857145 + x = 7.256242916 + -7.142857145 Combine like terms: 7.142857145 + -7.142857145 = 0.000000000 0.000000000 + x = 7.256242916 + -7.142857145 x = 7.256242916 + -7.142857145 Combine like terms: 7.256242916 + -7.142857145 = 0.113385771 x = 0.113385771 Simplifying x = 0.113385771

Subproblem 2

x + 7.142857145 = -7.256242916 Simplifying x + 7.142857145 = -7.256242916 Reorder the terms: 7.142857145 + x = -7.256242916 Solving 7.142857145 + x = -7.256242916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.142857145' to each side of the equation. 7.142857145 + -7.142857145 + x = -7.256242916 + -7.142857145 Combine like terms: 7.142857145 + -7.142857145 = 0.000000000 0.000000000 + x = -7.256242916 + -7.142857145 x = -7.256242916 + -7.142857145 Combine like terms: -7.256242916 + -7.142857145 = -14.399100061 x = -14.399100061 Simplifying x = -14.399100061

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.113385771, -14.399100061}

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