9.5=-.01x^2+.22x+8.30

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Solution for 9.5=-.01x^2+.22x+8.30 equation:


Simplifying
9.5 = -0.01x2 + 0.22x + 8.30

Reorder the terms:
9.5 = 8.30 + 0.22x + -0.01x2

Solving
9.5 = 8.30 + 0.22x + -0.01x2

Solving for variable 'x'.

Combine like terms: 9.5 + -8.30 = 1.2
1.2 + -0.22x + 0.01x2 = 8.30 + 0.22x + -0.01x2 + -8.30 + -0.22x + 0.01x2

Reorder the terms:
1.2 + -0.22x + 0.01x2 = 8.30 + -8.30 + 0.22x + -0.22x + -0.01x2 + 0.01x2

Combine like terms: 8.30 + -8.30 = 0.00
1.2 + -0.22x + 0.01x2 = 0.00 + 0.22x + -0.22x + -0.01x2 + 0.01x2
1.2 + -0.22x + 0.01x2 = 0.22x + -0.22x + -0.01x2 + 0.01x2

Combine like terms: 0.22x + -0.22x = 0.00
1.2 + -0.22x + 0.01x2 = 0.00 + -0.01x2 + 0.01x2
1.2 + -0.22x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
1.2 + -0.22x + 0.01x2 = 0.00

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

Divide each side by '0.01'.
120 + -22x + x2 = 0

Move the constant term to the right:

Add '-120' to each side of the equation.
120 + -22x + -120 + x2 = 0 + -120

Reorder the terms:
120 + -120 + -22x + x2 = 0 + -120

Combine like terms: 120 + -120 = 0
0 + -22x + x2 = 0 + -120
-22x + x2 = 0 + -120

Combine like terms: 0 + -120 = -120
-22x + x2 = -120

The x term is -22x.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x + 121 + x2 = -120 + 121

Reorder the terms:
121 + -22x + x2 = -120 + 121

Combine like terms: -120 + 121 = 1
121 + -22x + x2 = 1

Factor a perfect square on the left side:
(x + -11)(x + -11) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + -11) equal to 1 and -1.

Subproblem 1

x + -11 = 1 Simplifying x + -11 = 1 Reorder the terms: -11 + x = 1 Solving -11 + x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = 1 + 11 Combine like terms: -11 + 11 = 0 0 + x = 1 + 11 x = 1 + 11 Combine like terms: 1 + 11 = 12 x = 12 Simplifying x = 12

Subproblem 2

x + -11 = -1 Simplifying x + -11 = -1 Reorder the terms: -11 + x = -1 Solving -11 + x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = -1 + 11 Combine like terms: -11 + 11 = 0 0 + x = -1 + 11 x = -1 + 11 Combine like terms: -1 + 11 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12, 10}

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