25x^2-80x+91=0

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Solution for 25x^2-80x+91=0 equation:


Simplifying
25x2 + -80x + 91 = 0

Reorder the terms:
91 + -80x + 25x2 = 0

Solving
91 + -80x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
3.64 + -3.2x + x2 = 0

Move the constant term to the right:

Add '-3.64' to each side of the equation.
3.64 + -3.2x + -3.64 + x2 = 0 + -3.64

Reorder the terms:
3.64 + -3.64 + -3.2x + x2 = 0 + -3.64

Combine like terms: 3.64 + -3.64 = 0.00
0.00 + -3.2x + x2 = 0 + -3.64
-3.2x + x2 = 0 + -3.64

Combine like terms: 0 + -3.64 = -3.64
-3.2x + x2 = -3.64

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = -3.64 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = -3.64 + 2.56

Combine like terms: -3.64 + 2.56 = -1.08
2.56 + -3.2x + x2 = -1.08

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = -1.08

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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