2x^2-5x-195=0

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Solution for 2x^2-5x-195=0 equation:


Simplifying
2x2 + -5x + -195 = 0

Reorder the terms:
-195 + -5x + 2x2 = 0

Solving
-195 + -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'.
-97.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '97.5' to each side of the equation.
-97.5 + -2.5x + 97.5 + x2 = 0 + 97.5

Reorder the terms:
-97.5 + 97.5 + -2.5x + x2 = 0 + 97.5

Combine like terms: -97.5 + 97.5 = 0.0
0.0 + -2.5x + x2 = 0 + 97.5
-2.5x + x2 = 0 + 97.5

Combine like terms: 0 + 97.5 = 97.5
-2.5x + x2 = 97.5

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 = 97.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 97.5 + 1.5625

Combine like terms: 97.5 + 1.5625 = 99.0625
1.5625 + -2.5x + x2 = 99.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 99.0625

Calculate the square root of the right side: 9.953014619

Break this problem into two subproblems by setting 
(x + -1.25) equal to 9.953014619 and -9.953014619.

Subproblem 1

x + -1.25 = 9.953014619 Simplifying x + -1.25 = 9.953014619 Reorder the terms: -1.25 + x = 9.953014619 Solving -1.25 + x = 9.953014619 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 = 9.953014619 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 9.953014619 + 1.25 x = 9.953014619 + 1.25 Combine like terms: 9.953014619 + 1.25 = 11.203014619 x = 11.203014619 Simplifying x = 11.203014619

Subproblem 2

x + -1.25 = -9.953014619 Simplifying x + -1.25 = -9.953014619 Reorder the terms: -1.25 + x = -9.953014619 Solving -1.25 + x = -9.953014619 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 = -9.953014619 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -9.953014619 + 1.25 x = -9.953014619 + 1.25 Combine like terms: -9.953014619 + 1.25 = -8.703014619 x = -8.703014619 Simplifying x = -8.703014619

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.203014619, -8.703014619}

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