100=0.1x(30-x)

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Solution for 100=0.1x(30-x) equation:


Simplifying
100 = 0.1x(30 + -1x)
100 = (30 * 0.1x + -1x * 0.1x)
100 = (3x + -0.1x2)

Solving
100 = 3x + -0.1x2

Solving for variable 'x'.

Reorder the terms:
100 + -3x + 0.1x2 = 3x + -3x + -0.1x2 + 0.1x2

Combine like terms: 3x + -3x = 0
100 + -3x + 0.1x2 = 0 + -0.1x2 + 0.1x2
100 + -3x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
100 + -3x + 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'.
1000 + -30x + x2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + -30x + -1000 + x2 = 0 + -1000

Reorder the terms:
1000 + -1000 + -30x + x2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + -30x + x2 = 0 + -1000
-30x + x2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
-30x + x2 = -1000

The x term is -30x.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30x + 225 + x2 = -1000 + 225

Reorder the terms:
225 + -30x + x2 = -1000 + 225

Combine like terms: -1000 + 225 = -775
225 + -30x + x2 = -775

Factor a perfect square on the left side:
(x + -15)(x + -15) = -775

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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