x^2+10.8x-55.55=0

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Solution for x^2+10.8x-55.55=0 equation:


Simplifying
x2 + 10.8x + -55.55 = 0

Reorder the terms:
-55.55 + 10.8x + x2 = 0

Solving
-55.55 + 10.8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '55.55' to each side of the equation.
-55.55 + 10.8x + 55.55 + x2 = 0 + 55.55

Reorder the terms:
-55.55 + 55.55 + 10.8x + x2 = 0 + 55.55

Combine like terms: -55.55 + 55.55 = 0.00
0.00 + 10.8x + x2 = 0 + 55.55
10.8x + x2 = 0 + 55.55

Combine like terms: 0 + 55.55 = 55.55
10.8x + x2 = 55.55

The x term is 10.8x.  Take half its coefficient (5.4).
Square it (29.16) and add it to both sides.

Add '29.16' to each side of the equation.
10.8x + 29.16 + x2 = 55.55 + 29.16

Reorder the terms:
29.16 + 10.8x + x2 = 55.55 + 29.16

Combine like terms: 55.55 + 29.16 = 84.71
29.16 + 10.8x + x2 = 84.71

Factor a perfect square on the left side:
(x + 5.4)(x + 5.4) = 84.71

Calculate the square root of the right side: 9.203803562

Break this problem into two subproblems by setting 
(x + 5.4) equal to 9.203803562 and -9.203803562.

Subproblem 1

x + 5.4 = 9.203803562 Simplifying x + 5.4 = 9.203803562 Reorder the terms: 5.4 + x = 9.203803562 Solving 5.4 + x = 9.203803562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.4' to each side of the equation. 5.4 + -5.4 + x = 9.203803562 + -5.4 Combine like terms: 5.4 + -5.4 = 0.0 0.0 + x = 9.203803562 + -5.4 x = 9.203803562 + -5.4 Combine like terms: 9.203803562 + -5.4 = 3.803803562 x = 3.803803562 Simplifying x = 3.803803562

Subproblem 2

x + 5.4 = -9.203803562 Simplifying x + 5.4 = -9.203803562 Reorder the terms: 5.4 + x = -9.203803562 Solving 5.4 + x = -9.203803562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.4' to each side of the equation. 5.4 + -5.4 + x = -9.203803562 + -5.4 Combine like terms: 5.4 + -5.4 = 0.0 0.0 + x = -9.203803562 + -5.4 x = -9.203803562 + -5.4 Combine like terms: -9.203803562 + -5.4 = -14.603803562 x = -14.603803562 Simplifying x = -14.603803562

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.803803562, -14.603803562}

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