3x-x^2=15

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Solution for 3x-x^2=15 equation:


Simplifying
3x + -1x2 = 15

Solving
3x + -1x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 3x + -1x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 3x + -1x2 = 0

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

Divide each side by '-1'.
15 + -3x + x2 = 0

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -3x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -3x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -3x + x2 = 0 + -15
-3x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-3x + x2 = -15

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = -15 + 2.25

Reorder the terms:
2.25 + -3x + x2 = -15 + 2.25

Combine like terms: -15 + 2.25 = -12.75
2.25 + -3x + x2 = -12.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = -12.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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