x=-.02x^2+1.2x+5.085

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Solution for x=-.02x^2+1.2x+5.085 equation:


Simplifying
x = -0.02x2 + 1.2x + 5.085

Reorder the terms:
x = 5.085 + 1.2x + -0.02x2

Solving
x = 5.085 + 1.2x + -0.02x2

Solving for variable 'x'.

Reorder the terms:
-5.085 + x + -1.2x + 0.02x2 = 5.085 + 1.2x + -0.02x2 + -5.085 + -1.2x + 0.02x2

Combine like terms: x + -1.2x = -0.2x
-5.085 + -0.2x + 0.02x2 = 5.085 + 1.2x + -0.02x2 + -5.085 + -1.2x + 0.02x2

Reorder the terms:
-5.085 + -0.2x + 0.02x2 = 5.085 + -5.085 + 1.2x + -1.2x + -0.02x2 + 0.02x2

Combine like terms: 5.085 + -5.085 = 0.000
-5.085 + -0.2x + 0.02x2 = 0.000 + 1.2x + -1.2x + -0.02x2 + 0.02x2
-5.085 + -0.2x + 0.02x2 = 1.2x + -1.2x + -0.02x2 + 0.02x2

Combine like terms: 1.2x + -1.2x = 0.0
-5.085 + -0.2x + 0.02x2 = 0.0 + -0.02x2 + 0.02x2
-5.085 + -0.2x + 0.02x2 = -0.02x2 + 0.02x2

Combine like terms: -0.02x2 + 0.02x2 = 0.00
-5.085 + -0.2x + 0.02x2 = 0.00

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

Divide each side by '0.02'.
-254.25 + -10x + x2 = 0

Move the constant term to the right:

Add '254.25' to each side of the equation.
-254.25 + -10x + 254.25 + x2 = 0 + 254.25

Reorder the terms:
-254.25 + 254.25 + -10x + x2 = 0 + 254.25

Combine like terms: -254.25 + 254.25 = 0.00
0.00 + -10x + x2 = 0 + 254.25
-10x + x2 = 0 + 254.25

Combine like terms: 0 + 254.25 = 254.25
-10x + x2 = 254.25

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 = 254.25 + 25

Reorder the terms:
25 + -10x + x2 = 254.25 + 25

Combine like terms: 254.25 + 25 = 279.25
25 + -10x + x2 = 279.25

Factor a perfect square on the left side:
(x + -5)(x + -5) = 279.25

Calculate the square root of the right side: 16.710774967

Break this problem into two subproblems by setting 
(x + -5) equal to 16.710774967 and -16.710774967.

Subproblem 1

x + -5 = 16.710774967 Simplifying x + -5 = 16.710774967 Reorder the terms: -5 + x = 16.710774967 Solving -5 + x = 16.710774967 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 = 16.710774967 + 5 Combine like terms: -5 + 5 = 0 0 + x = 16.710774967 + 5 x = 16.710774967 + 5 Combine like terms: 16.710774967 + 5 = 21.710774967 x = 21.710774967 Simplifying x = 21.710774967

Subproblem 2

x + -5 = -16.710774967 Simplifying x + -5 = -16.710774967 Reorder the terms: -5 + x = -16.710774967 Solving -5 + x = -16.710774967 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 = -16.710774967 + 5 Combine like terms: -5 + 5 = 0 0 + x = -16.710774967 + 5 x = -16.710774967 + 5 Combine like terms: -16.710774967 + 5 = -11.710774967 x = -11.710774967 Simplifying x = -11.710774967

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.710774967, -11.710774967}

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