5-36x=2x^2

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Solution for 5-36x=2x^2 equation:


Simplifying
5 + -36x = 2x2

Solving
5 + -36x = 2x2

Solving for variable 'x'.

Combine like terms: 2x2 + -2x2 = 0
5 + -36x + -2x2 = 0

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

Divide each side by '-2'.
-2.5 + 18x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 18x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 18x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 18x + x2 = 0 + 2.5
18x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
18x + x2 = 2.5

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 = 2.5 + 81

Reorder the terms:
81 + 18x + x2 = 2.5 + 81

Combine like terms: 2.5 + 81 = 83.5
81 + 18x + x2 = 83.5

Factor a perfect square on the left side:
(x + 9)(x + 9) = 83.5

Calculate the square root of the right side: 9.137833441

Break this problem into two subproblems by setting 
(x + 9) equal to 9.137833441 and -9.137833441.

Subproblem 1

x + 9 = 9.137833441 Simplifying x + 9 = 9.137833441 Reorder the terms: 9 + x = 9.137833441 Solving 9 + x = 9.137833441 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 = 9.137833441 + -9 Combine like terms: 9 + -9 = 0 0 + x = 9.137833441 + -9 x = 9.137833441 + -9 Combine like terms: 9.137833441 + -9 = 0.137833441 x = 0.137833441 Simplifying x = 0.137833441

Subproblem 2

x + 9 = -9.137833441 Simplifying x + 9 = -9.137833441 Reorder the terms: 9 + x = -9.137833441 Solving 9 + x = -9.137833441 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 = -9.137833441 + -9 Combine like terms: 9 + -9 = 0 0 + x = -9.137833441 + -9 x = -9.137833441 + -9 Combine like terms: -9.137833441 + -9 = -18.137833441 x = -18.137833441 Simplifying x = -18.137833441

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.137833441, -18.137833441}

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