-3y(y-1)=9

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Solution for -3y(y-1)=9 equation:


Simplifying
-3y(y + -1) = 9

Reorder the terms:
-3y(-1 + y) = 9
(-1 * -3y + y * -3y) = 9
(3y + -3y2) = 9

Solving
3y + -3y2 = 9

Solving for variable 'y'.

Reorder the terms:
-9 + 3y + -3y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 3y + -3y2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-3 + y + -1y2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-3 + y + -1y2)' equal to zero and attempt to solve: Simplifying -3 + y + -1y2 = 0 Solving -3 + y + -1y2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 3 + -1y + y2 = 0 Move the constant term to the right: Add '-3' to each side of the equation. 3 + -1y + -3 + y2 = 0 + -3 Reorder the terms: 3 + -3 + -1y + y2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1y + y2 = 0 + -3 -1y + y2 = 0 + -3 Combine like terms: 0 + -3 = -3 -1y + y2 = -3 The y term is y. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1y + 0.25 + y2 = -3 + 0.25 Reorder the terms: 0.25 + -1y + y2 = -3 + 0.25 Combine like terms: -3 + 0.25 = -2.75 0.25 + -1y + y2 = -2.75 Factor a perfect square on the left side: (y + 0.5)(y + 0.5) = -2.75 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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