x^2-6.4x+9.8=0

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Solution for x^2-6.4x+9.8=0 equation:


Simplifying
x2 + -6.4x + 9.8 = 0

Reorder the terms:
9.8 + -6.4x + x2 = 0

Solving
9.8 + -6.4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-9.8' to each side of the equation.
9.8 + -6.4x + -9.8 + x2 = 0 + -9.8

Reorder the terms:
9.8 + -9.8 + -6.4x + x2 = 0 + -9.8

Combine like terms: 9.8 + -9.8 = 0.0
0.0 + -6.4x + x2 = 0 + -9.8
-6.4x + x2 = 0 + -9.8

Combine like terms: 0 + -9.8 = -9.8
-6.4x + x2 = -9.8

The x term is -6.4x.  Take half its coefficient (-3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
-6.4x + 10.24 + x2 = -9.8 + 10.24

Reorder the terms:
10.24 + -6.4x + x2 = -9.8 + 10.24

Combine like terms: -9.8 + 10.24 = 0.44
10.24 + -6.4x + x2 = 0.44

Factor a perfect square on the left side:
(x + -3.2)(x + -3.2) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(x + -3.2) equal to 0.663324958 and -0.663324958.

Subproblem 1

x + -3.2 = 0.663324958 Simplifying x + -3.2 = 0.663324958 Reorder the terms: -3.2 + x = 0.663324958 Solving -3.2 + x = 0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = 0.663324958 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = 0.663324958 + 3.2 x = 0.663324958 + 3.2 Combine like terms: 0.663324958 + 3.2 = 3.863324958 x = 3.863324958 Simplifying x = 3.863324958

Subproblem 2

x + -3.2 = -0.663324958 Simplifying x + -3.2 = -0.663324958 Reorder the terms: -3.2 + x = -0.663324958 Solving -3.2 + x = -0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = -0.663324958 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = -0.663324958 + 3.2 x = -0.663324958 + 3.2 Combine like terms: -0.663324958 + 3.2 = 2.536675042 x = 2.536675042 Simplifying x = 2.536675042

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.863324958, 2.536675042}

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