2x^2+5x-204=0

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Solution for 2x^2+5x-204=0 equation:


Simplifying
2x2 + 5x + -204 = 0

Reorder the terms:
-204 + 5x + 2x2 = 0

Solving
-204 + 5x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-102 + 2.5x + x2 = 0

Move the constant term to the right:

Add '102' to each side of the equation.
-102 + 2.5x + 102 + x2 = 0 + 102

Reorder the terms:
-102 + 102 + 2.5x + x2 = 0 + 102

Combine like terms: -102 + 102 = 0
0 + 2.5x + x2 = 0 + 102
2.5x + x2 = 0 + 102

Combine like terms: 0 + 102 = 102
2.5x + x2 = 102

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 102 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 102 + 1.5625

Combine like terms: 102 + 1.5625 = 103.5625
1.5625 + 2.5x + x2 = 103.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 103.5625

Calculate the square root of the right side: 10.176566219

Break this problem into two subproblems by setting 
(x + 1.25) equal to 10.176566219 and -10.176566219.

Subproblem 1

x + 1.25 = 10.176566219 Simplifying x + 1.25 = 10.176566219 Reorder the terms: 1.25 + x = 10.176566219 Solving 1.25 + x = 10.176566219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 10.176566219 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 10.176566219 + -1.25 x = 10.176566219 + -1.25 Combine like terms: 10.176566219 + -1.25 = 8.926566219 x = 8.926566219 Simplifying x = 8.926566219

Subproblem 2

x + 1.25 = -10.176566219 Simplifying x + 1.25 = -10.176566219 Reorder the terms: 1.25 + x = -10.176566219 Solving 1.25 + x = -10.176566219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -10.176566219 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -10.176566219 + -1.25 x = -10.176566219 + -1.25 Combine like terms: -10.176566219 + -1.25 = -11.426566219 x = -11.426566219 Simplifying x = -11.426566219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.926566219, -11.426566219}

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