2y^2=-2y+84

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Solution for 2y^2=-2y+84 equation:


Simplifying
2y2 = -2y + 84

Reorder the terms:
2y2 = 84 + -2y

Solving
2y2 = 84 + -2y

Solving for variable 'y'.

Reorder the terms:
-84 + 2y + 2y2 = 84 + -2y + -84 + 2y

Reorder the terms:
-84 + 2y + 2y2 = 84 + -84 + -2y + 2y

Combine like terms: 84 + -84 = 0
-84 + 2y + 2y2 = 0 + -2y + 2y
-84 + 2y + 2y2 = -2y + 2y

Combine like terms: -2y + 2y = 0
-84 + 2y + 2y2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-42 + y + y2) = 0

Factor a trinomial.
2((-7 + -1y)(6 + -1y)) = 0

Ignore the factor 2.

Subproblem 1

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

Subproblem 2

Set the factor '(6 + -1y)' equal to zero and attempt to solve: Simplifying 6 + -1y = 0 Solving 6 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1y = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1y = 0 + -6 -1y = 0 + -6 Combine like terms: 0 + -6 = -6 -1y = -6 Divide each side by '-1'. y = 6 Simplifying y = 6

Solution

y = {-7, 6}

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