-0.03x^2+0.3x+15=0

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Solution for -0.03x^2+0.3x+15=0 equation:


Simplifying
-0.03x2 + 0.3x + 15 = 0

Reorder the terms:
15 + 0.3x + -0.03x2 = 0

Solving
15 + 0.3x + -0.03x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.03 the coefficient of the squared term: 

Divide each side by '-0.03'.
-500 + -10x + x2 = 0

Move the constant term to the right:

Add '500' to each side of the equation.
-500 + -10x + 500 + x2 = 0 + 500

Reorder the terms:
-500 + 500 + -10x + x2 = 0 + 500

Combine like terms: -500 + 500 = 0
0 + -10x + x2 = 0 + 500
-10x + x2 = 0 + 500

Combine like terms: 0 + 500 = 500
-10x + x2 = 500

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 500 + 25

Reorder the terms:
25 + -10x + x2 = 500 + 25

Combine like terms: 500 + 25 = 525
25 + -10x + x2 = 525

Factor a perfect square on the left side:
(x + -5)(x + -5) = 525

Calculate the square root of the right side: 22.912878475

Break this problem into two subproblems by setting 
(x + -5) equal to 22.912878475 and -22.912878475.

Subproblem 1

x + -5 = 22.912878475 Simplifying x + -5 = 22.912878475 Reorder the terms: -5 + x = 22.912878475 Solving -5 + x = 22.912878475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 22.912878475 + 5 Combine like terms: -5 + 5 = 0 0 + x = 22.912878475 + 5 x = 22.912878475 + 5 Combine like terms: 22.912878475 + 5 = 27.912878475 x = 27.912878475 Simplifying x = 27.912878475

Subproblem 2

x + -5 = -22.912878475 Simplifying x + -5 = -22.912878475 Reorder the terms: -5 + x = -22.912878475 Solving -5 + x = -22.912878475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -22.912878475 + 5 Combine like terms: -5 + 5 = 0 0 + x = -22.912878475 + 5 x = -22.912878475 + 5 Combine like terms: -22.912878475 + 5 = -17.912878475 x = -17.912878475 Simplifying x = -17.912878475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.912878475, -17.912878475}

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