12x-x^2=84

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Solution for 12x-x^2=84 equation:


Simplifying
12x + -1x2 = 84

Solving
12x + -1x2 = 84

Solving for variable 'x'.

Reorder the terms:
-84 + 12x + -1x2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + 12x + -1x2 = 0

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

Divide each side by '-1'.
84 + -12x + x2 = 0

Move the constant term to the right:

Add '-84' to each side of the equation.
84 + -12x + -84 + x2 = 0 + -84

Reorder the terms:
84 + -84 + -12x + x2 = 0 + -84

Combine like terms: 84 + -84 = 0
0 + -12x + x2 = 0 + -84
-12x + x2 = 0 + -84

Combine like terms: 0 + -84 = -84
-12x + x2 = -84

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 = -84 + 36

Reorder the terms:
36 + -12x + x2 = -84 + 36

Combine like terms: -84 + 36 = -48
36 + -12x + x2 = -48

Factor a perfect square on the left side:
(x + -6)(x + -6) = -48

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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