9.2=-.01x^2+.29x+7.3

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Solution for 9.2=-.01x^2+.29x+7.3 equation:


Simplifying
9.2 = -0.01x2 + 0.29x + 7.3

Reorder the terms:
9.2 = 7.3 + 0.29x + -0.01x2

Solving
9.2 = 7.3 + 0.29x + -0.01x2

Solving for variable 'x'.

Combine like terms: 9.2 + -7.3 = 1.9
1.9 + -0.29x + 0.01x2 = 7.3 + 0.29x + -0.01x2 + -7.3 + -0.29x + 0.01x2

Reorder the terms:
1.9 + -0.29x + 0.01x2 = 7.3 + -7.3 + 0.29x + -0.29x + -0.01x2 + 0.01x2

Combine like terms: 7.3 + -7.3 = 0.0
1.9 + -0.29x + 0.01x2 = 0.0 + 0.29x + -0.29x + -0.01x2 + 0.01x2
1.9 + -0.29x + 0.01x2 = 0.29x + -0.29x + -0.01x2 + 0.01x2

Combine like terms: 0.29x + -0.29x = 0.00
1.9 + -0.29x + 0.01x2 = 0.00 + -0.01x2 + 0.01x2
1.9 + -0.29x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
1.9 + -0.29x + 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'.
190 + -29x + x2 = 0

Move the constant term to the right:

Add '-190' to each side of the equation.
190 + -29x + -190 + x2 = 0 + -190

Reorder the terms:
190 + -190 + -29x + x2 = 0 + -190

Combine like terms: 190 + -190 = 0
0 + -29x + x2 = 0 + -190
-29x + x2 = 0 + -190

Combine like terms: 0 + -190 = -190
-29x + x2 = -190

The x term is -29x.  Take half its coefficient (-14.5).
Square it (210.25) and add it to both sides.

Add '210.25' to each side of the equation.
-29x + 210.25 + x2 = -190 + 210.25

Reorder the terms:
210.25 + -29x + x2 = -190 + 210.25

Combine like terms: -190 + 210.25 = 20.25
210.25 + -29x + x2 = 20.25

Factor a perfect square on the left side:
(x + -14.5)(x + -14.5) = 20.25

Calculate the square root of the right side: 4.5

Break this problem into two subproblems by setting 
(x + -14.5) equal to 4.5 and -4.5.

Subproblem 1

x + -14.5 = 4.5 Simplifying x + -14.5 = 4.5 Reorder the terms: -14.5 + x = 4.5 Solving -14.5 + x = 4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14.5' to each side of the equation. -14.5 + 14.5 + x = 4.5 + 14.5 Combine like terms: -14.5 + 14.5 = 0.0 0.0 + x = 4.5 + 14.5 x = 4.5 + 14.5 Combine like terms: 4.5 + 14.5 = 19 x = 19 Simplifying x = 19

Subproblem 2

x + -14.5 = -4.5 Simplifying x + -14.5 = -4.5 Reorder the terms: -14.5 + x = -4.5 Solving -14.5 + x = -4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14.5' to each side of the equation. -14.5 + 14.5 + x = -4.5 + 14.5 Combine like terms: -14.5 + 14.5 = 0.0 0.0 + x = -4.5 + 14.5 x = -4.5 + 14.5 Combine like terms: -4.5 + 14.5 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19, 10}

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