0=-y^2+8y-18

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Solution for 0=-y^2+8y-18 equation:


Simplifying
0 = -1y2 + 8y + -18

Reorder the terms:
0 = -18 + 8y + -1y2

Solving
0 = -18 + 8y + -1y2

Solving for variable 'y'.

Combine like terms: 0 + 18 = 18
18 + -8y + y2 = -18 + 8y + -1y2 + 18 + -8y + y2

Reorder the terms:
18 + -8y + y2 = -18 + 18 + 8y + -8y + -1y2 + y2

Combine like terms: -18 + 18 = 0
18 + -8y + y2 = 0 + 8y + -8y + -1y2 + y2
18 + -8y + y2 = 8y + -8y + -1y2 + y2

Combine like terms: 8y + -8y = 0
18 + -8y + y2 = 0 + -1y2 + y2
18 + -8y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
18 + -8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -8y + -18 + y2 = 0 + -18

Reorder the terms:
18 + -18 + -8y + y2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -8y + y2 = 0 + -18
-8y + y2 = 0 + -18

Combine like terms: 0 + -18 = -18
-8y + y2 = -18

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 + 16

Reorder the terms:
16 + -8y + y2 = -18 + 16

Combine like terms: -18 + 16 = -2
16 + -8y + y2 = -2

Factor a perfect square on the left side:
(y + -4)(y + -4) = -2

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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