2x^2+36x=51

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Solution for 2x^2+36x=51 equation:


Simplifying
2x2 + 36x = 51

Reorder the terms:
36x + 2x2 = 51

Solving
36x + 2x2 = 51

Solving for variable 'x'.

Reorder the terms:
-51 + 36x + 2x2 = 51 + -51

Combine like terms: 51 + -51 = 0
-51 + 36x + 2x2 = 0

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

Divide each side by '2'.
-25.5 + 18x + x2 = 0

Move the constant term to the right:

Add '25.5' to each side of the equation.
-25.5 + 18x + 25.5 + x2 = 0 + 25.5

Reorder the terms:
-25.5 + 25.5 + 18x + x2 = 0 + 25.5

Combine like terms: -25.5 + 25.5 = 0.0
0.0 + 18x + x2 = 0 + 25.5
18x + x2 = 0 + 25.5

Combine like terms: 0 + 25.5 = 25.5
18x + x2 = 25.5

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 25.5 + 81

Reorder the terms:
81 + 18x + x2 = 25.5 + 81

Combine like terms: 25.5 + 81 = 106.5
81 + 18x + x2 = 106.5

Factor a perfect square on the left side:
(x + 9)(x + 9) = 106.5

Calculate the square root of the right side: 10.31988372

Break this problem into two subproblems by setting 
(x + 9) equal to 10.31988372 and -10.31988372.

Subproblem 1

x + 9 = 10.31988372 Simplifying x + 9 = 10.31988372 Reorder the terms: 9 + x = 10.31988372 Solving 9 + x = 10.31988372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 10.31988372 + -9 Combine like terms: 9 + -9 = 0 0 + x = 10.31988372 + -9 x = 10.31988372 + -9 Combine like terms: 10.31988372 + -9 = 1.31988372 x = 1.31988372 Simplifying x = 1.31988372

Subproblem 2

x + 9 = -10.31988372 Simplifying x + 9 = -10.31988372 Reorder the terms: 9 + x = -10.31988372 Solving 9 + x = -10.31988372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -10.31988372 + -9 Combine like terms: 9 + -9 = 0 0 + x = -10.31988372 + -9 x = -10.31988372 + -9 Combine like terms: -10.31988372 + -9 = -19.31988372 x = -19.31988372 Simplifying x = -19.31988372

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.31988372, -19.31988372}

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