10=-0.02x^2+1.2x

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Solution for 10=-0.02x^2+1.2x equation:


Simplifying
10 = -0.02x2 + 1.2x

Reorder the terms:
10 = 1.2x + -0.02x2

Solving
10 = 1.2x + -0.02x2

Solving for variable 'x'.

Reorder the terms:
10 + -1.2x + 0.02x2 = 1.2x + -1.2x + -0.02x2 + 0.02x2

Combine like terms: 1.2x + -1.2x = 0.0
10 + -1.2x + 0.02x2 = 0.0 + -0.02x2 + 0.02x2
10 + -1.2x + 0.02x2 = -0.02x2 + 0.02x2

Combine like terms: -0.02x2 + 0.02x2 = 0.00
10 + -1.2x + 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'.
500 + -60x + x2 = 0

Move the constant term to the right:

Add '-500' to each side of the equation.
500 + -60x + -500 + x2 = 0 + -500

Reorder the terms:
500 + -500 + -60x + x2 = 0 + -500

Combine like terms: 500 + -500 = 0
0 + -60x + x2 = 0 + -500
-60x + x2 = 0 + -500

Combine like terms: 0 + -500 = -500
-60x + x2 = -500

The x term is -60x.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60x + 900 + x2 = -500 + 900

Reorder the terms:
900 + -60x + x2 = -500 + 900

Combine like terms: -500 + 900 = 400
900 + -60x + x2 = 400

Factor a perfect square on the left side:
(x + -30)(x + -30) = 400

Calculate the square root of the right side: 20

Break this problem into two subproblems by setting 
(x + -30) equal to 20 and -20.

Subproblem 1

x + -30 = 20 Simplifying x + -30 = 20 Reorder the terms: -30 + x = 20 Solving -30 + x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = 20 + 30 Combine like terms: -30 + 30 = 0 0 + x = 20 + 30 x = 20 + 30 Combine like terms: 20 + 30 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + -30 = -20 Simplifying x + -30 = -20 Reorder the terms: -30 + x = -20 Solving -30 + x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = -20 + 30 Combine like terms: -30 + 30 = 0 0 + x = -20 + 30 x = -20 + 30 Combine like terms: -20 + 30 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, 10}

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