3y^2=-2y+21

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Solution for 3y^2=-2y+21 equation:


Simplifying
3y2 = -2y + 21

Reorder the terms:
3y2 = 21 + -2y

Solving
3y2 = 21 + -2y

Solving for variable 'y'.

Reorder the terms:
-21 + 2y + 3y2 = 21 + -2y + -21 + 2y

Reorder the terms:
-21 + 2y + 3y2 = 21 + -21 + -2y + 2y

Combine like terms: 21 + -21 = 0
-21 + 2y + 3y2 = 0 + -2y + 2y
-21 + 2y + 3y2 = -2y + 2y

Combine like terms: -2y + 2y = 0
-21 + 2y + 3y2 = 0

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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