3x^2+33x-8.7=0

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Solution for 3x^2+33x-8.7=0 equation:


Simplifying
3x2 + 33x + -8.7 = 0

Reorder the terms:
-8.7 + 33x + 3x2 = 0

Solving
-8.7 + 33x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-2.9 + 11x + x2 = 0

Move the constant term to the right:

Add '2.9' to each side of the equation.
-2.9 + 11x + 2.9 + x2 = 0 + 2.9

Reorder the terms:
-2.9 + 2.9 + 11x + x2 = 0 + 2.9

Combine like terms: -2.9 + 2.9 = 0.0
0.0 + 11x + x2 = 0 + 2.9
11x + x2 = 0 + 2.9

Combine like terms: 0 + 2.9 = 2.9
11x + x2 = 2.9

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 2.9 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 2.9 + 30.25

Combine like terms: 2.9 + 30.25 = 33.15
30.25 + 11x + x2 = 33.15

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 33.15

Calculate the square root of the right side: 5.757603668

Break this problem into two subproblems by setting 
(x + 5.5) equal to 5.757603668 and -5.757603668.

Subproblem 1

x + 5.5 = 5.757603668 Simplifying x + 5.5 = 5.757603668 Reorder the terms: 5.5 + x = 5.757603668 Solving 5.5 + x = 5.757603668 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 5.757603668 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 5.757603668 + -5.5 x = 5.757603668 + -5.5 Combine like terms: 5.757603668 + -5.5 = 0.257603668 x = 0.257603668 Simplifying x = 0.257603668

Subproblem 2

x + 5.5 = -5.757603668 Simplifying x + 5.5 = -5.757603668 Reorder the terms: 5.5 + x = -5.757603668 Solving 5.5 + x = -5.757603668 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -5.757603668 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -5.757603668 + -5.5 x = -5.757603668 + -5.5 Combine like terms: -5.757603668 + -5.5 = -11.257603668 x = -11.257603668 Simplifying x = -11.257603668

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.257603668, -11.257603668}

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