(2x^2)-(7x)-18x=5

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Solution for (2x^2)-(7x)-18x=5 equation:


Simplifying
(2x2) + -1(7x) + -18x = 5

Remove parenthesis around (7x)
(2x2) + -1 * 7x + -18x = 5

Multiply -1 * 7
(2x2) + -7x + -18x = 5

Reorder the terms:
-7x + -18x + (2x2) = 5

Combine like terms: -7x + -18x = -25x
-25x + (2x2) = 5

Solving
-25x + (2x2) = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -25x + (2x2) = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -25x + (2x2) = 0

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

Divide each side by '2'.
-2.5 + -12.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -12.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -12.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -12.5x + x2 = 0 + 2.5
-12.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-12.5x + x2 = 2.5

The x term is -12.5x.  Take half its coefficient (-6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
-12.5x + 39.0625 + x2 = 2.5 + 39.0625

Reorder the terms:
39.0625 + -12.5x + x2 = 2.5 + 39.0625

Combine like terms: 2.5 + 39.0625 = 41.5625
39.0625 + -12.5x + x2 = 41.5625

Factor a perfect square on the left side:
((x) + -6.25)((x) + -6.25) = 41.5625

Calculate the square root of the right side: 6.446898479

Break this problem into two subproblems by setting 
((x) + -6.25) equal to 6.446898479 and -6.446898479.

Subproblem 1

(x) + -6.25 = 6.446898479 Simplifying (x) + -6.25 = 6.446898479 x + -6.25 = 6.446898479 Reorder the terms: -6.25 + x = 6.446898479 Solving -6.25 + x = 6.446898479 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = 6.446898479 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = 6.446898479 + 6.25 x = 6.446898479 + 6.25 Combine like terms: 6.446898479 + 6.25 = 12.696898479 x = 12.696898479 Simplifying x = 12.696898479

Subproblem 2

(x) + -6.25 = -6.446898479 Simplifying (x) + -6.25 = -6.446898479 x + -6.25 = -6.446898479 Reorder the terms: -6.25 + x = -6.446898479 Solving -6.25 + x = -6.446898479 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = -6.446898479 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = -6.446898479 + 6.25 x = -6.446898479 + 6.25 Combine like terms: -6.446898479 + 6.25 = -0.196898479 x = -0.196898479 Simplifying x = -0.196898479

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.696898479, -0.196898479}

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