400=5(x)-0.1(x^2)

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Solution for 400=5(x)-0.1(x^2) equation:


Simplifying
400 = 5(x) + -0.1(x2)

Solving
400 = 5x + -0.1x2

Solving for variable 'x'.

Reorder the terms:
400 + -5x + 0.1x2 = 5x + -5x + -0.1x2 + 0.1x2

Combine like terms: 5x + -5x = 0
400 + -5x + 0.1x2 = 0 + -0.1x2 + 0.1x2
400 + -5x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
400 + -5x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
4000 + -50x + x2 = 0

Move the constant term to the right:

Add '-4000' to each side of the equation.
4000 + -50x + -4000 + x2 = 0 + -4000

Reorder the terms:
4000 + -4000 + -50x + x2 = 0 + -4000

Combine like terms: 4000 + -4000 = 0
0 + -50x + x2 = 0 + -4000
-50x + x2 = 0 + -4000

Combine like terms: 0 + -4000 = -4000
-50x + x2 = -4000

The x term is -50x.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50x + 625 + x2 = -4000 + 625

Reorder the terms:
625 + -50x + x2 = -4000 + 625

Combine like terms: -4000 + 625 = -3375
625 + -50x + x2 = -3375

Factor a perfect square on the left side:
(x + -25)(x + -25) = -3375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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