121=-0.2x^2+10x+1

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Solution for 121=-0.2x^2+10x+1 equation:


Simplifying
121 = -0.2x2 + 10x + 1

Reorder the terms:
121 = 1 + 10x + -0.2x2

Solving
121 = 1 + 10x + -0.2x2

Solving for variable 'x'.

Combine like terms: 121 + -1 = 120
120 + -10x + 0.2x2 = 1 + 10x + -0.2x2 + -1 + -10x + 0.2x2

Reorder the terms:
120 + -10x + 0.2x2 = 1 + -1 + 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 1 + -1 = 0
120 + -10x + 0.2x2 = 0 + 10x + -10x + -0.2x2 + 0.2x2
120 + -10x + 0.2x2 = 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 10x + -10x = 0
120 + -10x + 0.2x2 = 0 + -0.2x2 + 0.2x2
120 + -10x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
120 + -10x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
600 + -50x + x2 = 0

Move the constant term to the right:

Add '-600' to each side of the equation.
600 + -50x + -600 + x2 = 0 + -600

Reorder the terms:
600 + -600 + -50x + x2 = 0 + -600

Combine like terms: 600 + -600 = 0
0 + -50x + x2 = 0 + -600
-50x + x2 = 0 + -600

Combine like terms: 0 + -600 = -600
-50x + x2 = -600

The x term is -50x.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50x + 625 + x2 = -600 + 625

Reorder the terms:
625 + -50x + x2 = -600 + 625

Combine like terms: -600 + 625 = 25
625 + -50x + x2 = 25

Factor a perfect square on the left side:
(x + -25)(x + -25) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(x + -25) equal to 5 and -5.

Subproblem 1

x + -25 = 5 Simplifying x + -25 = 5 Reorder the terms: -25 + x = 5 Solving -25 + x = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = 5 + 25 Combine like terms: -25 + 25 = 0 0 + x = 5 + 25 x = 5 + 25 Combine like terms: 5 + 25 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + -25 = -5 Simplifying x + -25 = -5 Reorder the terms: -25 + x = -5 Solving -25 + x = -5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = -5 + 25 Combine like terms: -25 + 25 = 0 0 + x = -5 + 25 x = -5 + 25 Combine like terms: -5 + 25 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, 20}

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