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

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


Simplifying
(3 + -1y)(3y + 7) = 0

Reorder the terms:
(3 + -1y)(7 + 3y) = 0

Multiply (3 + -1y) * (7 + 3y)
(3(7 + 3y) + -1y * (7 + 3y)) = 0
((7 * 3 + 3y * 3) + -1y * (7 + 3y)) = 0
((21 + 9y) + -1y * (7 + 3y)) = 0
(21 + 9y + (7 * -1y + 3y * -1y)) = 0
(21 + 9y + (-7y + -3y2)) = 0

Combine like terms: 9y + -7y = 2y
(21 + 2y + -3y2) = 0

Solving
21 + 2y + -3y2 = 0

Solving for variable 'y'.

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

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 + 3y)' equal to zero and attempt to solve: Simplifying 7 + 3y = 0 Solving 7 + 3y = 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 + 3y = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 3y = 0 + -7 3y = 0 + -7 Combine like terms: 0 + -7 = -7 3y = -7 Divide each side by '3'. y = -2.333333333 Simplifying y = -2.333333333

Solution

y = {3, -2.333333333}

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