58=15+0.1x+0.0003x^2

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Solution for 58=15+0.1x+0.0003x^2 equation:


Simplifying
58 = 15 + 0.1x + 0.0003x2

Solving
58 = 15 + 0.1x + 0.0003x2

Solving for variable 'x'.

Combine like terms: 58 + -15 = 43
43 + -0.1x + -0.0003x2 = 15 + 0.1x + 0.0003x2 + -15 + -0.1x + -0.0003x2

Reorder the terms:
43 + -0.1x + -0.0003x2 = 15 + -15 + 0.1x + -0.1x + 0.0003x2 + -0.0003x2

Combine like terms: 15 + -15 = 0
43 + -0.1x + -0.0003x2 = 0 + 0.1x + -0.1x + 0.0003x2 + -0.0003x2
43 + -0.1x + -0.0003x2 = 0.1x + -0.1x + 0.0003x2 + -0.0003x2

Combine like terms: 0.1x + -0.1x = 0.0
43 + -0.1x + -0.0003x2 = 0.0 + 0.0003x2 + -0.0003x2
43 + -0.1x + -0.0003x2 = 0.0003x2 + -0.0003x2

Combine like terms: 0.0003x2 + -0.0003x2 = 0.0000
43 + -0.1x + -0.0003x2 = 0.0000

Begin completing the square.  Divide all terms by
-0.0003 the coefficient of the squared term: 

Divide each side by '-0.0003'.
-143333.3333 + 333.3333333x + x2 = 0

Move the constant term to the right:

Add '143333.3333' to each side of the equation.
-143333.3333 + 333.3333333x + 143333.3333 + x2 = 0 + 143333.3333

Reorder the terms:
-143333.3333 + 143333.3333 + 333.3333333x + x2 = 0 + 143333.3333

Combine like terms: -143333.3333 + 143333.3333 = 0.0000
0.0000 + 333.3333333x + x2 = 0 + 143333.3333
333.3333333x + x2 = 0 + 143333.3333

Combine like terms: 0 + 143333.3333 = 143333.3333
333.3333333x + x2 = 143333.3333

The x term is 333.3333333x.  Take half its coefficient (166.6666667).
Square it (27777.77779) and add it to both sides.

Add '27777.77779' to each side of the equation.
333.3333333x + 27777.77779 + x2 = 143333.3333 + 27777.77779

Reorder the terms:
27777.77779 + 333.3333333x + x2 = 143333.3333 + 27777.77779

Combine like terms: 143333.3333 + 27777.77779 = 171111.11109
27777.77779 + 333.3333333x + x2 = 171111.11109

Factor a perfect square on the left side:
(x + 166.6666667)(x + 166.6666667) = 171111.11109

Calculate the square root of the right side: 413.655788174

Break this problem into two subproblems by setting 
(x + 166.6666667) equal to 413.655788174 and -413.655788174.

Subproblem 1

x + 166.6666667 = 413.655788174 Simplifying x + 166.6666667 = 413.655788174 Reorder the terms: 166.6666667 + x = 413.655788174 Solving 166.6666667 + x = 413.655788174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-166.6666667' to each side of the equation. 166.6666667 + -166.6666667 + x = 413.655788174 + -166.6666667 Combine like terms: 166.6666667 + -166.6666667 = 0.0000000 0.0000000 + x = 413.655788174 + -166.6666667 x = 413.655788174 + -166.6666667 Combine like terms: 413.655788174 + -166.6666667 = 246.989121474 x = 246.989121474 Simplifying x = 246.989121474

Subproblem 2

x + 166.6666667 = -413.655788174 Simplifying x + 166.6666667 = -413.655788174 Reorder the terms: 166.6666667 + x = -413.655788174 Solving 166.6666667 + x = -413.655788174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-166.6666667' to each side of the equation. 166.6666667 + -166.6666667 + x = -413.655788174 + -166.6666667 Combine like terms: 166.6666667 + -166.6666667 = 0.0000000 0.0000000 + x = -413.655788174 + -166.6666667 x = -413.655788174 + -166.6666667 Combine like terms: -413.655788174 + -166.6666667 = -580.322454874 x = -580.322454874 Simplifying x = -580.322454874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {246.989121474, -580.322454874}

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