0.25x^2-10x+800=20

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Solution for 0.25x^2-10x+800=20 equation:


Simplifying
0.25x2 + -10x + 800 = 20

Reorder the terms:
800 + -10x + 0.25x2 = 20

Solving
800 + -10x + 0.25x2 = 20

Solving for variable 'x'.

Reorder the terms:
800 + -20 + -10x + 0.25x2 = 20 + -20

Combine like terms: 800 + -20 = 780
780 + -10x + 0.25x2 = 20 + -20

Combine like terms: 20 + -20 = 0
780 + -10x + 0.25x2 = 0

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

Divide each side by '0.25'.
3120 + -40x + x2 = 0

Move the constant term to the right:

Add '-3120' to each side of the equation.
3120 + -40x + -3120 + x2 = 0 + -3120

Reorder the terms:
3120 + -3120 + -40x + x2 = 0 + -3120

Combine like terms: 3120 + -3120 = 0
0 + -40x + x2 = 0 + -3120
-40x + x2 = 0 + -3120

Combine like terms: 0 + -3120 = -3120
-40x + x2 = -3120

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = -3120 + 400

Reorder the terms:
400 + -40x + x2 = -3120 + 400

Combine like terms: -3120 + 400 = -2720
400 + -40x + x2 = -2720

Factor a perfect square on the left side:
(x + -20)(x + -20) = -2720

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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