x^2-5.5x-3=0

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Solution for x^2-5.5x-3=0 equation:


Simplifying
x2 + -5.5x + -3 = 0

Reorder the terms:
-3 + -5.5x + x2 = 0

Solving
-3 + -5.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -5.5x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -5.5x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -5.5x + x2 = 0 + 3
-5.5x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-5.5x + x2 = 3

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = 3 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = 3 + 7.5625

Combine like terms: 3 + 7.5625 = 10.5625
7.5625 + -5.5x + x2 = 10.5625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 10.5625

Calculate the square root of the right side: 3.25

Break this problem into two subproblems by setting 
(x + -2.75) equal to 3.25 and -3.25.

Subproblem 1

x + -2.75 = 3.25 Simplifying x + -2.75 = 3.25 Reorder the terms: -2.75 + x = 3.25 Solving -2.75 + x = 3.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 3.25 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 3.25 + 2.75 x = 3.25 + 2.75 Combine like terms: 3.25 + 2.75 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + -2.75 = -3.25 Simplifying x + -2.75 = -3.25 Reorder the terms: -2.75 + x = -3.25 Solving -2.75 + x = -3.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -3.25 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -3.25 + 2.75 x = -3.25 + 2.75 Combine like terms: -3.25 + 2.75 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, -0.5}

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