8.5x^2-170x+714=0

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Solution for 8.5x^2-170x+714=0 equation:


Simplifying
8.5x2 + -170x + 714 = 0

Reorder the terms:
714 + -170x + 8.5x2 = 0

Solving
714 + -170x + 8.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '8.5'.
84 + -20x + x2 = 0

Move the constant term to the right:

Add '-84' to each side of the equation.
84 + -20x + -84 + x2 = 0 + -84

Reorder the terms:
84 + -84 + -20x + x2 = 0 + -84

Combine like terms: 84 + -84 = 0
0 + -20x + x2 = 0 + -84
-20x + x2 = 0 + -84

Combine like terms: 0 + -84 = -84
-20x + x2 = -84

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -84 + 100

Reorder the terms:
100 + -20x + x2 = -84 + 100

Combine like terms: -84 + 100 = 16
100 + -20x + x2 = 16

Factor a perfect square on the left side:
(x + -10)(x + -10) = 16

Calculate the square root of the right side: 4

Break this problem into two subproblems by setting 
(x + -10) equal to 4 and -4.

Subproblem 1

x + -10 = 4 Simplifying x + -10 = 4 Reorder the terms: -10 + x = 4 Solving -10 + x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 4 + 10 Combine like terms: -10 + 10 = 0 0 + x = 4 + 10 x = 4 + 10 Combine like terms: 4 + 10 = 14 x = 14 Simplifying x = 14

Subproblem 2

x + -10 = -4 Simplifying x + -10 = -4 Reorder the terms: -10 + x = -4 Solving -10 + x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -4 + 10 Combine like terms: -10 + 10 = 0 0 + x = -4 + 10 x = -4 + 10 Combine like terms: -4 + 10 = 6 x = 6 Simplifying x = 6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14, 6}

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