105.5-.1x=.01x^2+5.75

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Solution for 105.5-.1x=.01x^2+5.75 equation:


Simplifying
105.5 + -0.1x = 0.01x2 + 5.75

Reorder the terms:
105.5 + -0.1x = 5.75 + 0.01x2

Solving
105.5 + -0.1x = 5.75 + 0.01x2

Solving for variable 'x'.

Reorder the terms:
105.5 + -5.75 + -0.1x + -0.01x2 = 5.75 + 0.01x2 + -5.75 + -0.01x2

Combine like terms: 105.5 + -5.75 = 99.75
99.75 + -0.1x + -0.01x2 = 5.75 + 0.01x2 + -5.75 + -0.01x2

Reorder the terms:
99.75 + -0.1x + -0.01x2 = 5.75 + -5.75 + 0.01x2 + -0.01x2

Combine like terms: 5.75 + -5.75 = 0.00
99.75 + -0.1x + -0.01x2 = 0.00 + 0.01x2 + -0.01x2
99.75 + -0.1x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
99.75 + -0.1x + -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'.
-9975 + 10x + x2 = 0

Move the constant term to the right:

Add '9975' to each side of the equation.
-9975 + 10x + 9975 + x2 = 0 + 9975

Reorder the terms:
-9975 + 9975 + 10x + x2 = 0 + 9975

Combine like terms: -9975 + 9975 = 0
0 + 10x + x2 = 0 + 9975
10x + x2 = 0 + 9975

Combine like terms: 0 + 9975 = 9975
10x + x2 = 9975

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 9975 + 25

Reorder the terms:
25 + 10x + x2 = 9975 + 25

Combine like terms: 9975 + 25 = 10000
25 + 10x + x2 = 10000

Factor a perfect square on the left side:
(x + 5)(x + 5) = 10000

Calculate the square root of the right side: 100

Break this problem into two subproblems by setting 
(x + 5) equal to 100 and -100.

Subproblem 1

x + 5 = 100 Simplifying x + 5 = 100 Reorder the terms: 5 + x = 100 Solving 5 + x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 100 + -5 Combine like terms: 5 + -5 = 0 0 + x = 100 + -5 x = 100 + -5 Combine like terms: 100 + -5 = 95 x = 95 Simplifying x = 95

Subproblem 2

x + 5 = -100 Simplifying x + 5 = -100 Reorder the terms: 5 + x = -100 Solving 5 + x = -100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -100 + -5 Combine like terms: 5 + -5 = 0 0 + x = -100 + -5 x = -100 + -5 Combine like terms: -100 + -5 = -105 x = -105 Simplifying x = -105

Solution

The solution to the problem is based on the solutions from the subproblems. x = {95, -105}

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