2x^2+27x=9

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Solution for 2x^2+27x=9 equation:


Simplifying
2x2 + 27x = 9

Reorder the terms:
27x + 2x2 = 9

Solving
27x + 2x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 27x + 2x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 27x + 2x2 = 0

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

Divide each side by '2'.
-4.5 + 13.5x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 13.5x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 13.5x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 13.5x + x2 = 0 + 4.5
13.5x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
13.5x + x2 = 4.5

The x term is 13.5x.  Take half its coefficient (6.75).
Square it (45.5625) and add it to both sides.

Add '45.5625' to each side of the equation.
13.5x + 45.5625 + x2 = 4.5 + 45.5625

Reorder the terms:
45.5625 + 13.5x + x2 = 4.5 + 45.5625

Combine like terms: 4.5 + 45.5625 = 50.0625
45.5625 + 13.5x + x2 = 50.0625

Factor a perfect square on the left side:
(x + 6.75)(x + 6.75) = 50.0625

Calculate the square root of the right side: 7.075485849

Break this problem into two subproblems by setting 
(x + 6.75) equal to 7.075485849 and -7.075485849.

Subproblem 1

x + 6.75 = 7.075485849 Simplifying x + 6.75 = 7.075485849 Reorder the terms: 6.75 + x = 7.075485849 Solving 6.75 + x = 7.075485849 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.75' to each side of the equation. 6.75 + -6.75 + x = 7.075485849 + -6.75 Combine like terms: 6.75 + -6.75 = 0.00 0.00 + x = 7.075485849 + -6.75 x = 7.075485849 + -6.75 Combine like terms: 7.075485849 + -6.75 = 0.325485849 x = 0.325485849 Simplifying x = 0.325485849

Subproblem 2

x + 6.75 = -7.075485849 Simplifying x + 6.75 = -7.075485849 Reorder the terms: 6.75 + x = -7.075485849 Solving 6.75 + x = -7.075485849 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.75' to each side of the equation. 6.75 + -6.75 + x = -7.075485849 + -6.75 Combine like terms: 6.75 + -6.75 = 0.00 0.00 + x = -7.075485849 + -6.75 x = -7.075485849 + -6.75 Combine like terms: -7.075485849 + -6.75 = -13.825485849 x = -13.825485849 Simplifying x = -13.825485849

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.325485849, -13.825485849}

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