180=16x-.1x^2-100

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Solution for 180=16x-.1x^2-100 equation:


Simplifying
180 = 16x + -0.1x2 + -100

Reorder the terms:
180 = -100 + 16x + -0.1x2

Solving
180 = -100 + 16x + -0.1x2

Solving for variable 'x'.

Combine like terms: 180 + 100 = 280
280 + -16x + 0.1x2 = -100 + 16x + -0.1x2 + 100 + -16x + 0.1x2

Reorder the terms:
280 + -16x + 0.1x2 = -100 + 100 + 16x + -16x + -0.1x2 + 0.1x2

Combine like terms: -100 + 100 = 0
280 + -16x + 0.1x2 = 0 + 16x + -16x + -0.1x2 + 0.1x2
280 + -16x + 0.1x2 = 16x + -16x + -0.1x2 + 0.1x2

Combine like terms: 16x + -16x = 0
280 + -16x + 0.1x2 = 0 + -0.1x2 + 0.1x2
280 + -16x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
280 + -16x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
2800 + -160x + x2 = 0

Move the constant term to the right:

Add '-2800' to each side of the equation.
2800 + -160x + -2800 + x2 = 0 + -2800

Reorder the terms:
2800 + -2800 + -160x + x2 = 0 + -2800

Combine like terms: 2800 + -2800 = 0
0 + -160x + x2 = 0 + -2800
-160x + x2 = 0 + -2800

Combine like terms: 0 + -2800 = -2800
-160x + x2 = -2800

The x term is -160x.  Take half its coefficient (-80).
Square it (6400) and add it to both sides.

Add '6400' to each side of the equation.
-160x + 6400 + x2 = -2800 + 6400

Reorder the terms:
6400 + -160x + x2 = -2800 + 6400

Combine like terms: -2800 + 6400 = 3600
6400 + -160x + x2 = 3600

Factor a perfect square on the left side:
(x + -80)(x + -80) = 3600

Calculate the square root of the right side: 60

Break this problem into two subproblems by setting 
(x + -80) equal to 60 and -60.

Subproblem 1

x + -80 = 60 Simplifying x + -80 = 60 Reorder the terms: -80 + x = 60 Solving -80 + x = 60 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '80' to each side of the equation. -80 + 80 + x = 60 + 80 Combine like terms: -80 + 80 = 0 0 + x = 60 + 80 x = 60 + 80 Combine like terms: 60 + 80 = 140 x = 140 Simplifying x = 140

Subproblem 2

x + -80 = -60 Simplifying x + -80 = -60 Reorder the terms: -80 + x = -60 Solving -80 + x = -60 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '80' to each side of the equation. -80 + 80 + x = -60 + 80 Combine like terms: -80 + 80 = 0 0 + x = -60 + 80 x = -60 + 80 Combine like terms: -60 + 80 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {140, 20}

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