5.5x^2-19.5x+13=0

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Solution for 5.5x^2-19.5x+13=0 equation:


Simplifying
5.5x2 + -19.5x + 13 = 0

Reorder the terms:
13 + -19.5x + 5.5x2 = 0

Solving
13 + -19.5x + 5.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5.5'.
2.363636364 + -3.545454545x + x2 = 0

Move the constant term to the right:

Add '-2.363636364' to each side of the equation.
2.363636364 + -3.545454545x + -2.363636364 + x2 = 0 + -2.363636364

Reorder the terms:
2.363636364 + -2.363636364 + -3.545454545x + x2 = 0 + -2.363636364

Combine like terms: 2.363636364 + -2.363636364 = 0.000000000
0.000000000 + -3.545454545x + x2 = 0 + -2.363636364
-3.545454545x + x2 = 0 + -2.363636364

Combine like terms: 0 + -2.363636364 = -2.363636364
-3.545454545x + x2 = -2.363636364

The x term is -3.545454545x.  Take half its coefficient (-1.772727273).
Square it (3.142561984) and add it to both sides.

Add '3.142561984' to each side of the equation.
-3.545454545x + 3.142561984 + x2 = -2.363636364 + 3.142561984

Reorder the terms:
3.142561984 + -3.545454545x + x2 = -2.363636364 + 3.142561984

Combine like terms: -2.363636364 + 3.142561984 = 0.77892562
3.142561984 + -3.545454545x + x2 = 0.77892562

Factor a perfect square on the left side:
(x + -1.772727273)(x + -1.772727273) = 0.77892562

Calculate the square root of the right side: 0.882567629

Break this problem into two subproblems by setting 
(x + -1.772727273) equal to 0.882567629 and -0.882567629.

Subproblem 1

x + -1.772727273 = 0.882567629 Simplifying x + -1.772727273 = 0.882567629 Reorder the terms: -1.772727273 + x = 0.882567629 Solving -1.772727273 + x = 0.882567629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.772727273' to each side of the equation. -1.772727273 + 1.772727273 + x = 0.882567629 + 1.772727273 Combine like terms: -1.772727273 + 1.772727273 = 0.000000000 0.000000000 + x = 0.882567629 + 1.772727273 x = 0.882567629 + 1.772727273 Combine like terms: 0.882567629 + 1.772727273 = 2.655294902 x = 2.655294902 Simplifying x = 2.655294902

Subproblem 2

x + -1.772727273 = -0.882567629 Simplifying x + -1.772727273 = -0.882567629 Reorder the terms: -1.772727273 + x = -0.882567629 Solving -1.772727273 + x = -0.882567629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.772727273' to each side of the equation. -1.772727273 + 1.772727273 + x = -0.882567629 + 1.772727273 Combine like terms: -1.772727273 + 1.772727273 = 0.000000000 0.000000000 + x = -0.882567629 + 1.772727273 x = -0.882567629 + 1.772727273 Combine like terms: -0.882567629 + 1.772727273 = 0.890159644 x = 0.890159644 Simplifying x = 0.890159644

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.655294902, 0.890159644}

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