-4y^2+32y-64=9

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Solution for -4y^2+32y-64=9 equation:


Simplifying
-4y2 + 32y + -64 = 9

Reorder the terms:
-64 + 32y + -4y2 = 9

Solving
-64 + 32y + -4y2 = 9

Solving for variable 'y'.

Reorder the terms:
-64 + -9 + 32y + -4y2 = 9 + -9

Combine like terms: -64 + -9 = -73
-73 + 32y + -4y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-73 + 32y + -4y2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
18.25 + -8y + y2 = 0

Move the constant term to the right:

Add '-18.25' to each side of the equation.
18.25 + -8y + -18.25 + y2 = 0 + -18.25

Reorder the terms:
18.25 + -18.25 + -8y + y2 = 0 + -18.25

Combine like terms: 18.25 + -18.25 = 0.00
0.00 + -8y + y2 = 0 + -18.25
-8y + y2 = 0 + -18.25

Combine like terms: 0 + -18.25 = -18.25
-8y + y2 = -18.25

The y term is -8y.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8y + 16 + y2 = -18.25 + 16

Reorder the terms:
16 + -8y + y2 = -18.25 + 16

Combine like terms: -18.25 + 16 = -2.25
16 + -8y + y2 = -2.25

Factor a perfect square on the left side:
(y + -4)(y + -4) = -2.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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