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Simplifying y2 + -21y = 0 Reorder the terms: -21y + y2 = 0 Solving -21y + y2 = 0 Solving for variable 'y'. Factor out the Greatest Common Factor (GCF), 'y'. y(-21 + y) = 0Subproblem 1
Set the factor 'y' equal to zero and attempt to solve: Simplifying y = 0 Solving y = 0 Move all terms containing y to the left, all other terms to the right. Simplifying y = 0Subproblem 2
Set the factor '(-21 + y)' equal to zero and attempt to solve: Simplifying -21 + y = 0 Solving -21 + y = 0 Move all terms containing y to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + y = 0 + 21 y = 0 + 21 Combine like terms: 0 + 21 = 21 y = 21 Simplifying y = 21Solution
y = {0, 21}
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