(y^2+9)=4y-12

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Solution for (y^2+9)=4y-12 equation:


Simplifying
(y2 + 9) = 4y + -12

Reorder the terms:
(9 + y2) = 4y + -12

Remove parenthesis around (9 + y2)
9 + y2 = 4y + -12

Reorder the terms:
9 + y2 = -12 + 4y

Solving
9 + y2 = -12 + 4y

Solving for variable 'y'.

Reorder the terms:
9 + 12 + -4y + y2 = -12 + 4y + 12 + -4y

Combine like terms: 9 + 12 = 21
21 + -4y + y2 = -12 + 4y + 12 + -4y

Reorder the terms:
21 + -4y + y2 = -12 + 12 + 4y + -4y

Combine like terms: -12 + 12 = 0
21 + -4y + y2 = 0 + 4y + -4y
21 + -4y + y2 = 4y + -4y

Combine like terms: 4y + -4y = 0
21 + -4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-21' to each side of the equation.
21 + -4y + -21 + y2 = 0 + -21

Reorder the terms:
21 + -21 + -4y + y2 = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -4y + y2 = 0 + -21
-4y + y2 = 0 + -21

Combine like terms: 0 + -21 = -21
-4y + y2 = -21

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -21 + 4

Reorder the terms:
4 + -4y + y2 = -21 + 4

Combine like terms: -21 + 4 = -17
4 + -4y + y2 = -17

Factor a perfect square on the left side:
(y + -2)(y + -2) = -17

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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