-.01x^2+.23x+8.8=9.7

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Solution for -.01x^2+.23x+8.8=9.7 equation:


Simplifying
-0.01x2 + 0.23x + 8.8 = 9.7

Reorder the terms:
8.8 + 0.23x + -0.01x2 = 9.7

Solving
8.8 + 0.23x + -0.01x2 = 9.7

Solving for variable 'x'.

Reorder the terms:
8.8 + -9.7 + 0.23x + -0.01x2 = 9.7 + -9.7

Combine like terms: 8.8 + -9.7 = -0.9
-0.9 + 0.23x + -0.01x2 = 9.7 + -9.7

Combine like terms: 9.7 + -9.7 = 0.0
-0.9 + 0.23x + -0.01x2 = 0.0

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

Divide each side by '-0.01'.
90 + -23x + x2 = 0

Move the constant term to the right:

Add '-90' to each side of the equation.
90 + -23x + -90 + x2 = 0 + -90

Reorder the terms:
90 + -90 + -23x + x2 = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -23x + x2 = 0 + -90
-23x + x2 = 0 + -90

Combine like terms: 0 + -90 = -90
-23x + x2 = -90

The x term is -23x.  Take half its coefficient (-11.5).
Square it (132.25) and add it to both sides.

Add '132.25' to each side of the equation.
-23x + 132.25 + x2 = -90 + 132.25

Reorder the terms:
132.25 + -23x + x2 = -90 + 132.25

Combine like terms: -90 + 132.25 = 42.25
132.25 + -23x + x2 = 42.25

Factor a perfect square on the left side:
(x + -11.5)(x + -11.5) = 42.25

Calculate the square root of the right side: 6.5

Break this problem into two subproblems by setting 
(x + -11.5) equal to 6.5 and -6.5.

Subproblem 1

x + -11.5 = 6.5 Simplifying x + -11.5 = 6.5 Reorder the terms: -11.5 + x = 6.5 Solving -11.5 + x = 6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.5' to each side of the equation. -11.5 + 11.5 + x = 6.5 + 11.5 Combine like terms: -11.5 + 11.5 = 0.0 0.0 + x = 6.5 + 11.5 x = 6.5 + 11.5 Combine like terms: 6.5 + 11.5 = 18 x = 18 Simplifying x = 18

Subproblem 2

x + -11.5 = -6.5 Simplifying x + -11.5 = -6.5 Reorder the terms: -11.5 + x = -6.5 Solving -11.5 + x = -6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.5' to each side of the equation. -11.5 + 11.5 + x = -6.5 + 11.5 Combine like terms: -11.5 + 11.5 = 0.0 0.0 + x = -6.5 + 11.5 x = -6.5 + 11.5 Combine like terms: -6.5 + 11.5 = 5 x = 5 Simplifying x = 5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18, 5}

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