8X-.1X^2-5=0

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Solution for 8X-.1X^2-5=0 equation:


Simplifying
8X + -0.1X2 + -5 = 0

Reorder the terms:
-5 + 8X + -0.1X2 = 0

Solving
-5 + 8X + -0.1X2 = 0

Solving for variable 'X'.

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

Divide each side by '-0.1'.
50 + -80X + X2 = 0

Move the constant term to the right:

Add '-50' to each side of the equation.
50 + -80X + -50 + X2 = 0 + -50

Reorder the terms:
50 + -50 + -80X + X2 = 0 + -50

Combine like terms: 50 + -50 = 0
0 + -80X + X2 = 0 + -50
-80X + X2 = 0 + -50

Combine like terms: 0 + -50 = -50
-80X + X2 = -50

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 = -50 + 1600

Reorder the terms:
1600 + -80X + X2 = -50 + 1600

Combine like terms: -50 + 1600 = 1550
1600 + -80X + X2 = 1550

Factor a perfect square on the left side:
(X + -40)(X + -40) = 1550

Calculate the square root of the right side: 39.37003937

Break this problem into two subproblems by setting 
(X + -40) equal to 39.37003937 and -39.37003937.

Subproblem 1

X + -40 = 39.37003937 Simplifying X + -40 = 39.37003937 Reorder the terms: -40 + X = 39.37003937 Solving -40 + X = 39.37003937 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 = 39.37003937 + 40 Combine like terms: -40 + 40 = 0 0 + X = 39.37003937 + 40 X = 39.37003937 + 40 Combine like terms: 39.37003937 + 40 = 79.37003937 X = 79.37003937 Simplifying X = 79.37003937

Subproblem 2

X + -40 = -39.37003937 Simplifying X + -40 = -39.37003937 Reorder the terms: -40 + X = -39.37003937 Solving -40 + X = -39.37003937 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 = -39.37003937 + 40 Combine like terms: -40 + 40 = 0 0 + X = -39.37003937 + 40 X = -39.37003937 + 40 Combine like terms: -39.37003937 + 40 = 0.62996063 X = 0.62996063 Simplifying X = 0.62996063

Solution

The solution to the problem is based on the solutions from the subproblems. X = {79.37003937, 0.62996063}

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