0.5x^2-6x+21=0

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Solution for 0.5x^2-6x+21=0 equation:


Simplifying
0.5x2 + -6x + 21 = 0

Reorder the terms:
21 + -6x + 0.5x2 = 0

Solving
21 + -6x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
42 + -12x + x2 = 0

Move the constant term to the right:

Add '-42' to each side of the equation.
42 + -12x + -42 + x2 = 0 + -42

Reorder the terms:
42 + -42 + -12x + x2 = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -12x + x2 = 0 + -42
-12x + x2 = 0 + -42

Combine like terms: 0 + -42 = -42
-12x + x2 = -42

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -42 + 36

Reorder the terms:
36 + -12x + x2 = -42 + 36

Combine like terms: -42 + 36 = -6
36 + -12x + x2 = -6

Factor a perfect square on the left side:
(x + -6)(x + -6) = -6

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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