x^2-5.1x+6.3=0

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Solution for x^2-5.1x+6.3=0 equation:


Simplifying
x2 + -5.1x + 6.3 = 0

Reorder the terms:
6.3 + -5.1x + x2 = 0

Solving
6.3 + -5.1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-6.3' to each side of the equation.
6.3 + -5.1x + -6.3 + x2 = 0 + -6.3

Reorder the terms:
6.3 + -6.3 + -5.1x + x2 = 0 + -6.3

Combine like terms: 6.3 + -6.3 = 0.0
0.0 + -5.1x + x2 = 0 + -6.3
-5.1x + x2 = 0 + -6.3

Combine like terms: 0 + -6.3 = -6.3
-5.1x + x2 = -6.3

The x term is -5.1x.  Take half its coefficient (-2.55).
Square it (6.5025) and add it to both sides.

Add '6.5025' to each side of the equation.
-5.1x + 6.5025 + x2 = -6.3 + 6.5025

Reorder the terms:
6.5025 + -5.1x + x2 = -6.3 + 6.5025

Combine like terms: -6.3 + 6.5025 = 0.2025
6.5025 + -5.1x + x2 = 0.2025

Factor a perfect square on the left side:
(x + -2.55)(x + -2.55) = 0.2025

Calculate the square root of the right side: 0.45

Break this problem into two subproblems by setting 
(x + -2.55) equal to 0.45 and -0.45.

Subproblem 1

x + -2.55 = 0.45 Simplifying x + -2.55 = 0.45 Reorder the terms: -2.55 + x = 0.45 Solving -2.55 + x = 0.45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.55' to each side of the equation. -2.55 + 2.55 + x = 0.45 + 2.55 Combine like terms: -2.55 + 2.55 = 0.00 0.00 + x = 0.45 + 2.55 x = 0.45 + 2.55 Combine like terms: 0.45 + 2.55 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + -2.55 = -0.45 Simplifying x + -2.55 = -0.45 Reorder the terms: -2.55 + x = -0.45 Solving -2.55 + x = -0.45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.55' to each side of the equation. -2.55 + 2.55 + x = -0.45 + 2.55 Combine like terms: -2.55 + 2.55 = 0.00 0.00 + x = -0.45 + 2.55 x = -0.45 + 2.55 Combine like terms: -0.45 + 2.55 = 2.1 x = 2.1 Simplifying x = 2.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, 2.1}

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