(3y-9)(y-7)=0

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Solution for (3y-9)(y-7)=0 equation:


Simplifying
(3y + -9)(y + -7) = 0

Reorder the terms:
(-9 + 3y)(y + -7) = 0

Reorder the terms:
(-9 + 3y)(-7 + y) = 0

Multiply (-9 + 3y) * (-7 + y)
(-9(-7 + y) + 3y * (-7 + y)) = 0
((-7 * -9 + y * -9) + 3y * (-7 + y)) = 0
((63 + -9y) + 3y * (-7 + y)) = 0
(63 + -9y + (-7 * 3y + y * 3y)) = 0
(63 + -9y + (-21y + 3y2)) = 0

Combine like terms: -9y + -21y = -30y
(63 + -30y + 3y2) = 0

Solving
63 + -30y + 3y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '3'.
3(21 + -10y + y2) = 0

Factor a trinomial.
3((3 + -1y)(7 + -1y)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(3 + -1y)' equal to zero and attempt to solve: Simplifying 3 + -1y = 0 Solving 3 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1y = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1y = 0 + -3 -1y = 0 + -3 Combine like terms: 0 + -3 = -3 -1y = -3 Divide each side by '-1'. y = 3 Simplifying y = 3

Subproblem 2

Set the factor '(7 + -1y)' equal to zero and attempt to solve: Simplifying 7 + -1y = 0 Solving 7 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1y = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1y = 0 + -7 -1y = 0 + -7 Combine like terms: 0 + -7 = -7 -1y = -7 Divide each side by '-1'. y = 7 Simplifying y = 7

Solution

y = {3, 7}

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