2x^2=30x+27

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Solution for 2x^2=30x+27 equation:


Simplifying
2x2 = 30x + 27

Reorder the terms:
2x2 = 27 + 30x

Solving
2x2 = 27 + 30x

Solving for variable 'x'.

Reorder the terms:
-27 + -30x + 2x2 = 27 + 30x + -27 + -30x

Reorder the terms:
-27 + -30x + 2x2 = 27 + -27 + 30x + -30x

Combine like terms: 27 + -27 = 0
-27 + -30x + 2x2 = 0 + 30x + -30x
-27 + -30x + 2x2 = 30x + -30x

Combine like terms: 30x + -30x = 0
-27 + -30x + 2x2 = 0

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

Divide each side by '2'.
-13.5 + -15x + x2 = 0

Move the constant term to the right:

Add '13.5' to each side of the equation.
-13.5 + -15x + 13.5 + x2 = 0 + 13.5

Reorder the terms:
-13.5 + 13.5 + -15x + x2 = 0 + 13.5

Combine like terms: -13.5 + 13.5 = 0.0
0.0 + -15x + x2 = 0 + 13.5
-15x + x2 = 0 + 13.5

Combine like terms: 0 + 13.5 = 13.5
-15x + x2 = 13.5

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = 13.5 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 13.5 + 56.25

Combine like terms: 13.5 + 56.25 = 69.75
56.25 + -15x + x2 = 69.75

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 69.75

Calculate the square root of the right side: 8.351646544

Break this problem into two subproblems by setting 
(x + -7.5) equal to 8.351646544 and -8.351646544.

Subproblem 1

x + -7.5 = 8.351646544 Simplifying x + -7.5 = 8.351646544 Reorder the terms: -7.5 + x = 8.351646544 Solving -7.5 + x = 8.351646544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 8.351646544 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 8.351646544 + 7.5 x = 8.351646544 + 7.5 Combine like terms: 8.351646544 + 7.5 = 15.851646544 x = 15.851646544 Simplifying x = 15.851646544

Subproblem 2

x + -7.5 = -8.351646544 Simplifying x + -7.5 = -8.351646544 Reorder the terms: -7.5 + x = -8.351646544 Solving -7.5 + x = -8.351646544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -8.351646544 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -8.351646544 + 7.5 x = -8.351646544 + 7.5 Combine like terms: -8.351646544 + 7.5 = -0.851646544 x = -0.851646544 Simplifying x = -0.851646544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.851646544, -0.851646544}

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