12x-x^2=75

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Solution for 12x-x^2=75 equation:


Simplifying
12x + -1x2 = 75

Solving
12x + -1x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 12x + -1x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 12x + -1x2 = 0

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

Divide each side by '-1'.
75 + -12x + x2 = 0

Move the constant term to the right:

Add '-75' to each side of the equation.
75 + -12x + -75 + x2 = 0 + -75

Reorder the terms:
75 + -75 + -12x + x2 = 0 + -75

Combine like terms: 75 + -75 = 0
0 + -12x + x2 = 0 + -75
-12x + x2 = 0 + -75

Combine like terms: 0 + -75 = -75
-12x + x2 = -75

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 = -75 + 36

Reorder the terms:
36 + -12x + x2 = -75 + 36

Combine like terms: -75 + 36 = -39
36 + -12x + x2 = -39

Factor a perfect square on the left side:
(x + -6)(x + -6) = -39

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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