n^2-3n+15=9

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Solution for n^2-3n+15=9 equation:


Simplifying
n2 + -3n + 15 = 9

Reorder the terms:
15 + -3n + n2 = 9

Solving
15 + -3n + n2 = 9

Solving for variable 'n'.

Reorder the terms:
15 + -9 + -3n + n2 = 9 + -9

Combine like terms: 15 + -9 = 6
6 + -3n + n2 = 9 + -9

Combine like terms: 9 + -9 = 0
6 + -3n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -3n + -6 + n2 = 0 + -6

Reorder the terms:
6 + -6 + -3n + n2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -3n + n2 = 0 + -6
-3n + n2 = 0 + -6

Combine like terms: 0 + -6 = -6
-3n + n2 = -6

The n term is -3n.  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.
-3n + 2.25 + n2 = -6 + 2.25

Reorder the terms:
2.25 + -3n + n2 = -6 + 2.25

Combine like terms: -6 + 2.25 = -3.75
2.25 + -3n + n2 = -3.75

Factor a perfect square on the left side:
(n + -1.5)(n + -1.5) = -3.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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