0.2x^2-2.6x+7.2=0

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Solution for 0.2x^2-2.6x+7.2=0 equation:


Simplifying
0.2x2 + -2.6x + 7.2 = 0

Reorder the terms:
7.2 + -2.6x + 0.2x2 = 0

Solving
7.2 + -2.6x + 0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.2'.
36 + -13x + x2 = 0

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + -13x + -36 + x2 = 0 + -36

Reorder the terms:
36 + -36 + -13x + x2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -13x + x2 = 0 + -36
-13x + x2 = 0 + -36

Combine like terms: 0 + -36 = -36
-13x + x2 = -36

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = -36 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -36 + 42.25

Combine like terms: -36 + 42.25 = 6.25
42.25 + -13x + x2 = 6.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 6.25

Calculate the square root of the right side: 2.5

Break this problem into two subproblems by setting 
(x + -6.5) equal to 2.5 and -2.5.

Subproblem 1

x + -6.5 = 2.5 Simplifying x + -6.5 = 2.5 Reorder the terms: -6.5 + x = 2.5 Solving -6.5 + x = 2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 2.5 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 2.5 + 6.5 x = 2.5 + 6.5 Combine like terms: 2.5 + 6.5 = 9 x = 9 Simplifying x = 9

Subproblem 2

x + -6.5 = -2.5 Simplifying x + -6.5 = -2.5 Reorder the terms: -6.5 + x = -2.5 Solving -6.5 + x = -2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -2.5 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -2.5 + 6.5 x = -2.5 + 6.5 Combine like terms: -2.5 + 6.5 = 4 x = 4 Simplifying x = 4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9, 4}

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