-.1x^2+8x-60=60

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Solution for -.1x^2+8x-60=60 equation:


Simplifying
-0.1x2 + 8x + -60 = 60

Reorder the terms:
-60 + 8x + -0.1x2 = 60

Solving
-60 + 8x + -0.1x2 = 60

Solving for variable 'x'.

Reorder the terms:
-60 + -60 + 8x + -0.1x2 = 60 + -60

Combine like terms: -60 + -60 = -120
-120 + 8x + -0.1x2 = 60 + -60

Combine like terms: 60 + -60 = 0
-120 + 8x + -0.1x2 = 0

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

Divide each side by '-0.1'.
1200 + -80x + x2 = 0

Move the constant term to the right:

Add '-1200' to each side of the equation.
1200 + -80x + -1200 + x2 = 0 + -1200

Reorder the terms:
1200 + -1200 + -80x + x2 = 0 + -1200

Combine like terms: 1200 + -1200 = 0
0 + -80x + x2 = 0 + -1200
-80x + x2 = 0 + -1200

Combine like terms: 0 + -1200 = -1200
-80x + x2 = -1200

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = -1200 + 1600

Reorder the terms:
1600 + -80x + x2 = -1200 + 1600

Combine like terms: -1200 + 1600 = 400
1600 + -80x + x2 = 400

Factor a perfect square on the left side:
(x + -40)(x + -40) = 400

Calculate the square root of the right side: 20

Break this problem into two subproblems by setting 
(x + -40) equal to 20 and -20.

Subproblem 1

x + -40 = 20 Simplifying x + -40 = 20 Reorder the terms: -40 + x = 20 Solving -40 + x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 20 + 40 Combine like terms: -40 + 40 = 0 0 + x = 20 + 40 x = 20 + 40 Combine like terms: 20 + 40 = 60 x = 60 Simplifying x = 60

Subproblem 2

x + -40 = -20 Simplifying x + -40 = -20 Reorder the terms: -40 + x = -20 Solving -40 + x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -20 + 40 Combine like terms: -40 + 40 = 0 0 + x = -20 + 40 x = -20 + 40 Combine like terms: -20 + 40 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {60, 20}

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