4x^2-91x+25=0

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Solution for 4x^2-91x+25=0 equation:


Simplifying
4x2 + -91x + 25 = 0

Reorder the terms:
25 + -91x + 4x2 = 0

Solving
25 + -91x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
6.25 + -22.75x + x2 = 0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + -22.75x + -6.25 + x2 = 0 + -6.25

Reorder the terms:
6.25 + -6.25 + -22.75x + x2 = 0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + -22.75x + x2 = 0 + -6.25
-22.75x + x2 = 0 + -6.25

Combine like terms: 0 + -6.25 = -6.25
-22.75x + x2 = -6.25

The x term is -22.75x.  Take half its coefficient (-11.375).
Square it (129.390625) and add it to both sides.

Add '129.390625' to each side of the equation.
-22.75x + 129.390625 + x2 = -6.25 + 129.390625

Reorder the terms:
129.390625 + -22.75x + x2 = -6.25 + 129.390625

Combine like terms: -6.25 + 129.390625 = 123.140625
129.390625 + -22.75x + x2 = 123.140625

Factor a perfect square on the left side:
(x + -11.375)(x + -11.375) = 123.140625

Calculate the square root of the right side: 11.09687456

Break this problem into two subproblems by setting 
(x + -11.375) equal to 11.09687456 and -11.09687456.

Subproblem 1

x + -11.375 = 11.09687456 Simplifying x + -11.375 = 11.09687456 Reorder the terms: -11.375 + x = 11.09687456 Solving -11.375 + x = 11.09687456 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.375' to each side of the equation. -11.375 + 11.375 + x = 11.09687456 + 11.375 Combine like terms: -11.375 + 11.375 = 0.000 0.000 + x = 11.09687456 + 11.375 x = 11.09687456 + 11.375 Combine like terms: 11.09687456 + 11.375 = 22.47187456 x = 22.47187456 Simplifying x = 22.47187456

Subproblem 2

x + -11.375 = -11.09687456 Simplifying x + -11.375 = -11.09687456 Reorder the terms: -11.375 + x = -11.09687456 Solving -11.375 + x = -11.09687456 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.375' to each side of the equation. -11.375 + 11.375 + x = -11.09687456 + 11.375 Combine like terms: -11.375 + 11.375 = 0.000 0.000 + x = -11.09687456 + 11.375 x = -11.09687456 + 11.375 Combine like terms: -11.09687456 + 11.375 = 0.27812544 x = 0.27812544 Simplifying x = 0.27812544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.47187456, 0.27812544}

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