2x^2-45x-91=0

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Solution for 2x^2-45x-91=0 equation:


Simplifying
2x2 + -45x + -91 = 0

Reorder the terms:
-91 + -45x + 2x2 = 0

Solving
-91 + -45x + 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'.
-45.5 + -22.5x + x2 = 0

Move the constant term to the right:

Add '45.5' to each side of the equation.
-45.5 + -22.5x + 45.5 + x2 = 0 + 45.5

Reorder the terms:
-45.5 + 45.5 + -22.5x + x2 = 0 + 45.5

Combine like terms: -45.5 + 45.5 = 0.0
0.0 + -22.5x + x2 = 0 + 45.5
-22.5x + x2 = 0 + 45.5

Combine like terms: 0 + 45.5 = 45.5
-22.5x + x2 = 45.5

The x term is -22.5x.  Take half its coefficient (-11.25).
Square it (126.5625) and add it to both sides.

Add '126.5625' to each side of the equation.
-22.5x + 126.5625 + x2 = 45.5 + 126.5625

Reorder the terms:
126.5625 + -22.5x + x2 = 45.5 + 126.5625

Combine like terms: 45.5 + 126.5625 = 172.0625
126.5625 + -22.5x + x2 = 172.0625

Factor a perfect square on the left side:
(x + -11.25)(x + -11.25) = 172.0625

Calculate the square root of the right side: 13.117259622

Break this problem into two subproblems by setting 
(x + -11.25) equal to 13.117259622 and -13.117259622.

Subproblem 1

x + -11.25 = 13.117259622 Simplifying x + -11.25 = 13.117259622 Reorder the terms: -11.25 + x = 13.117259622 Solving -11.25 + x = 13.117259622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.25' to each side of the equation. -11.25 + 11.25 + x = 13.117259622 + 11.25 Combine like terms: -11.25 + 11.25 = 0.00 0.00 + x = 13.117259622 + 11.25 x = 13.117259622 + 11.25 Combine like terms: 13.117259622 + 11.25 = 24.367259622 x = 24.367259622 Simplifying x = 24.367259622

Subproblem 2

x + -11.25 = -13.117259622 Simplifying x + -11.25 = -13.117259622 Reorder the terms: -11.25 + x = -13.117259622 Solving -11.25 + x = -13.117259622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.25' to each side of the equation. -11.25 + 11.25 + x = -13.117259622 + 11.25 Combine like terms: -11.25 + 11.25 = 0.00 0.00 + x = -13.117259622 + 11.25 x = -13.117259622 + 11.25 Combine like terms: -13.117259622 + 11.25 = -1.867259622 x = -1.867259622 Simplifying x = -1.867259622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.367259622, -1.867259622}

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