50=-0.006x^2+1.2x+10

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Solution for 50=-0.006x^2+1.2x+10 equation:


Simplifying
50 = -0.006x2 + 1.2x + 10

Reorder the terms:
50 = 10 + 1.2x + -0.006x2

Solving
50 = 10 + 1.2x + -0.006x2

Solving for variable 'x'.

Combine like terms: 50 + -10 = 40
40 + -1.2x + 0.006x2 = 10 + 1.2x + -0.006x2 + -10 + -1.2x + 0.006x2

Reorder the terms:
40 + -1.2x + 0.006x2 = 10 + -10 + 1.2x + -1.2x + -0.006x2 + 0.006x2

Combine like terms: 10 + -10 = 0
40 + -1.2x + 0.006x2 = 0 + 1.2x + -1.2x + -0.006x2 + 0.006x2
40 + -1.2x + 0.006x2 = 1.2x + -1.2x + -0.006x2 + 0.006x2

Combine like terms: 1.2x + -1.2x = 0.0
40 + -1.2x + 0.006x2 = 0.0 + -0.006x2 + 0.006x2
40 + -1.2x + 0.006x2 = -0.006x2 + 0.006x2

Combine like terms: -0.006x2 + 0.006x2 = 0.000
40 + -1.2x + 0.006x2 = 0.000

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

Divide each side by '0.006'.
6666.666667 + -200x + x2 = 0

Move the constant term to the right:

Add '-6666.666667' to each side of the equation.
6666.666667 + -200x + -6666.666667 + x2 = 0 + -6666.666667

Reorder the terms:
6666.666667 + -6666.666667 + -200x + x2 = 0 + -6666.666667

Combine like terms: 6666.666667 + -6666.666667 = 0.000000
0.000000 + -200x + x2 = 0 + -6666.666667
-200x + x2 = 0 + -6666.666667

Combine like terms: 0 + -6666.666667 = -6666.666667
-200x + x2 = -6666.666667

The x term is -200x.  Take half its coefficient (-100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
-200x + 10000 + x2 = -6666.666667 + 10000

Reorder the terms:
10000 + -200x + x2 = -6666.666667 + 10000

Combine like terms: -6666.666667 + 10000 = 3333.333333
10000 + -200x + x2 = 3333.333333

Factor a perfect square on the left side:
(x + -100)(x + -100) = 3333.333333

Calculate the square root of the right side: 57.735026916

Break this problem into two subproblems by setting 
(x + -100) equal to 57.735026916 and -57.735026916.

Subproblem 1

x + -100 = 57.735026916 Simplifying x + -100 = 57.735026916 Reorder the terms: -100 + x = 57.735026916 Solving -100 + x = 57.735026916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = 57.735026916 + 100 Combine like terms: -100 + 100 = 0 0 + x = 57.735026916 + 100 x = 57.735026916 + 100 Combine like terms: 57.735026916 + 100 = 157.735026916 x = 157.735026916 Simplifying x = 157.735026916

Subproblem 2

x + -100 = -57.735026916 Simplifying x + -100 = -57.735026916 Reorder the terms: -100 + x = -57.735026916 Solving -100 + x = -57.735026916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = -57.735026916 + 100 Combine like terms: -100 + 100 = 0 0 + x = -57.735026916 + 100 x = -57.735026916 + 100 Combine like terms: -57.735026916 + 100 = 42.264973084 x = 42.264973084 Simplifying x = 42.264973084

Solution

The solution to the problem is based on the solutions from the subproblems. x = {157.735026916, 42.264973084}

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