x^2+6.6x-89.11=0

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Solution for x^2+6.6x-89.11=0 equation:


Simplifying
x2 + 6.6x + -89.11 = 0

Reorder the terms:
-89.11 + 6.6x + x2 = 0

Solving
-89.11 + 6.6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '89.11' to each side of the equation.
-89.11 + 6.6x + 89.11 + x2 = 0 + 89.11

Reorder the terms:
-89.11 + 89.11 + 6.6x + x2 = 0 + 89.11

Combine like terms: -89.11 + 89.11 = 0.00
0.00 + 6.6x + x2 = 0 + 89.11
6.6x + x2 = 0 + 89.11

Combine like terms: 0 + 89.11 = 89.11
6.6x + x2 = 89.11

The x term is 6.6x.  Take half its coefficient (3.3).
Square it (10.89) and add it to both sides.

Add '10.89' to each side of the equation.
6.6x + 10.89 + x2 = 89.11 + 10.89

Reorder the terms:
10.89 + 6.6x + x2 = 89.11 + 10.89

Combine like terms: 89.11 + 10.89 = 100
10.89 + 6.6x + x2 = 100

Factor a perfect square on the left side:
(x + 3.3)(x + 3.3) = 100

Calculate the square root of the right side: 10

Break this problem into two subproblems by setting 
(x + 3.3) equal to 10 and -10.

Subproblem 1

x + 3.3 = 10 Simplifying x + 3.3 = 10 Reorder the terms: 3.3 + x = 10 Solving 3.3 + x = 10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.3' to each side of the equation. 3.3 + -3.3 + x = 10 + -3.3 Combine like terms: 3.3 + -3.3 = 0.0 0.0 + x = 10 + -3.3 x = 10 + -3.3 Combine like terms: 10 + -3.3 = 6.7 x = 6.7 Simplifying x = 6.7

Subproblem 2

x + 3.3 = -10 Simplifying x + 3.3 = -10 Reorder the terms: 3.3 + x = -10 Solving 3.3 + x = -10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.3' to each side of the equation. 3.3 + -3.3 + x = -10 + -3.3 Combine like terms: 3.3 + -3.3 = 0.0 0.0 + x = -10 + -3.3 x = -10 + -3.3 Combine like terms: -10 + -3.3 = -13.3 x = -13.3 Simplifying x = -13.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.7, -13.3}

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