25x-x^2=400

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Solution for 25x-x^2=400 equation:


Simplifying
25x + -1x2 = 400

Solving
25x + -1x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 25x + -1x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 25x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
400 + -25x + x2 = 0

Move the constant term to the right:

Add '-400' to each side of the equation.
400 + -25x + -400 + x2 = 0 + -400

Reorder the terms:
400 + -400 + -25x + x2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -25x + x2 = 0 + -400
-25x + x2 = 0 + -400

Combine like terms: 0 + -400 = -400
-25x + x2 = -400

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = -400 + 156.25

Reorder the terms:
156.25 + -25x + x2 = -400 + 156.25

Combine like terms: -400 + 156.25 = -243.75
156.25 + -25x + x2 = -243.75

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = -243.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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