60=12x-.3x^2

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Solution for 60=12x-.3x^2 equation:


Simplifying
60 = 12x + -0.3x2

Solving
60 = 12x + -0.3x2

Solving for variable 'x'.

Reorder the terms:
60 + -12x + 0.3x2 = 12x + -12x + -0.3x2 + 0.3x2

Combine like terms: 12x + -12x = 0
60 + -12x + 0.3x2 = 0 + -0.3x2 + 0.3x2
60 + -12x + 0.3x2 = -0.3x2 + 0.3x2

Combine like terms: -0.3x2 + 0.3x2 = 0.0
60 + -12x + 0.3x2 = 0.0

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

Divide each side by '0.3'.
200 + -40x + x2 = 0

Move the constant term to the right:

Add '-200' to each side of the equation.
200 + -40x + -200 + x2 = 0 + -200

Reorder the terms:
200 + -200 + -40x + x2 = 0 + -200

Combine like terms: 200 + -200 = 0
0 + -40x + x2 = 0 + -200
-40x + x2 = 0 + -200

Combine like terms: 0 + -200 = -200
-40x + x2 = -200

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = -200 + 400

Reorder the terms:
400 + -40x + x2 = -200 + 400

Combine like terms: -200 + 400 = 200
400 + -40x + x2 = 200

Factor a perfect square on the left side:
(x + -20)(x + -20) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(x + -20) equal to 14.142135624 and -14.142135624.

Subproblem 1

x + -20 = 14.142135624 Simplifying x + -20 = 14.142135624 Reorder the terms: -20 + x = 14.142135624 Solving -20 + x = 14.142135624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 14.142135624 + 20 Combine like terms: -20 + 20 = 0 0 + x = 14.142135624 + 20 x = 14.142135624 + 20 Combine like terms: 14.142135624 + 20 = 34.142135624 x = 34.142135624 Simplifying x = 34.142135624

Subproblem 2

x + -20 = -14.142135624 Simplifying x + -20 = -14.142135624 Reorder the terms: -20 + x = -14.142135624 Solving -20 + x = -14.142135624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -14.142135624 + 20 Combine like terms: -20 + 20 = 0 0 + x = -14.142135624 + 20 x = -14.142135624 + 20 Combine like terms: -14.142135624 + 20 = 5.857864376 x = 5.857864376 Simplifying x = 5.857864376

Solution

The solution to the problem is based on the solutions from the subproblems. x = {34.142135624, 5.857864376}

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